UEFA Champions Research Articles

‘Full speed ahead Barcelona’: the social construction of Roy Keane’s 1999 semi-final performance versus Juventus

ABSTRACT For over 30 years, the men's UEFA Champions League (UCL) has showcased Europe's most elite and wealthiest football clubs. Debates surrounding the competition’s best individual performance rarely reach a consensus. However, one common response points towards Manchester United’s Roy Keane versus Juventus in the 1999 semi-final second leg. After falling 2-0 behind within 11 minutes, Keane almost single-handedly swung the game in United's favour as the final in Barcelona loomed. This article examines Keane's performance through the lens of a sociological case-study, drawing on the circumstances of his career and the match itself. Critical attention is given to sociologist Everett Hughes’ conceptual belief of turning points, which has been innovatively applied to a single event in this paper. The author argues that, while statistics have typically driven performance analysis, only a sociological interpretation of Keane's performance provides an accurately sophisticated comprehension of, arguably, one of the UCL’s greatest individual performances.

The relative age effect is widespread among European adult professional soccer players but does not affect their market value.

The relative age effect (RAE) is most prevalent in highly competitive youth soccer and persists to a lesser extent in senior soccer. However, it is known that soccer players born in the second half of the year are as successful at senior level, indicating that they are equally talented although under-represented at youth level due to bias during the selection process, in which the emphasis is on more pronounced physical qualities in a specific period of time. Examining the prevalence of the RAE among professional soccer players depending on the level of competition and playing position, as well as analyzing the relationship between the player's birth quarter and market value, are of scientific interest. The dates of birth, playing position, and market value of all adult male soccer players included in the final rosters of teams from the top-division of 54 European countries, listed on www.transfermarkt.com on August 15th, 2020, were analyzed (18,429 soccer players in total). All players were categorized into four groups according to the quarter of birth (Q) and playing position. All teams were further sub-divided in groups depending on the soccer clubs' level of representation in the UEFA Champions League. Of 18,429 players, 30.9% were born in Q1, 25.7% in Q2, 23.8% in Q3 and 19.6% in Q4. The number of soccer players born in Q1 was lower in less competitive leagues. The number of players born in Q1 decreased as the level of competition decreased; the highest percentage of these players was observed in clubs that are among the top 50 ranked in UEFA or compete in the most prestigious European championships. The RAE was less pronounced in teams that participate in lower competitive championships. There was no significant difference in market value between players playing position and level of competition when born in different quarters. Although, the most expensive soccer players in the European championships were late-born forwards. Players of various groups differed in their market value. The RAE is currently prevalent in all the most competitive senior soccer leagues and teams in Europe regardless of playing position. There are no significant differences in market value between players of the same playing position and level of competition when born in different quarters. The most expensive soccer players in the European championships are forwards born in Q4. These findings may indicate that the under-representation of "late-born" soccer players in youth, and then consequently in adult soccer, is not associated with lower talent, but with other factors, possibly based on physiological characteristics and socio-cultural factors. Further measures are needed to mitigate the discriminatory effects of selection bias based on the RAE.

When do football fans tend to acquire a more Europeanised mind-set? The impact of participation in European club competitions

ABSTRACT How has the Europeanisation of football at the level of governance (due to for example the effects of the Bosman ruling and the formation of the UEFA Champions League) – influenced the identities of football fans? This paper explores how such structural Europeanisation in football is influencing identifications among fans. Based on an analysis of articulations in selected online message boards, we distil the positioning of fans towards ‘Europe’ in football, and the factors which shape it. We control for three main avenues of impact: the club level, the league level, and the societal context. Our inquiry is based on a set of paired comparisons of fan scenes for football clubs in four different European countries. Results show that the factor carrying the most explanatory power is the club’s participation in European-level competition. Although this broadly confirms a ‘contact hypothesis’ – according to which the more fans are exposed to cross-border contacts, the less relevance they attribute to aspects of national belonging – significant variations of how frequent exposure to European-level competition translates into more Europeanised perceptions do exist. For European identity studies, the work corroborates that a lifeworld arena such as football can foster Europeanised identifications, albeit not in a uniform manner.

Match Outcome and Running Performance Among UEFA Champions League Soccer Players

This study aimed to examine position-specific differences in running performance (RP) according to the match outcome in UEFA Champions League (UCL). The players’ RPs (n=244) were collected during UCL group stage matches (n=20) in the 2020/21 season using semiautomatic optical system InStat Fitness, and classified according to their playing positions as: central defenders (CD; n=79), fullbacks (FB; n=65), central midfielders (CM; n=55), wide midfielders (WM; n=28) and forward (FW; n=17). The RP variables included: total distance covered, low-intensity (LIR) (<14.3km/h), running (14.4–19.7 km/h), high-speed running (HSR) (19.8–25.1 km/h), and sprinting (>25.2 km/h). Match outcome was observed as win, draw and loss. One-way analysis of variance (ANOVA) was used to examine differences in RP according to the match outcome. Significant differences in TD (F-test=4.16, p=0.02) and LIR (F-test=4.51, p=0.01) among match outcomes were observed for FBs. Specifically, FBs covered significantly greater TD when their team won than when lost (p=0.03, d=0.79). In addition, FBs’ LIR was significantly greater in won matches than in drew (p=0.04, d=0.92) and lost matches (p=0.03, d=0.77). The RP of players on all other playing position were similar irrespective to the match outcome (F-test=0.08 to 2.84, all p>0.05). These results indicated that winning UCL matches is not strongly influenced by players’ physical performance, except for FBs who tended to covered greater total- and low- distance when their teams won. This study indicated limited overall influence of RP on success in matches at elite-level soccer. The findings from this study may help soccer coaches to ensure optimal physical preparation of players in elite soccer.

Technical Differences over the Course of the Match: An Analysis of Three Elite Teams in the UEFA Champions League.

The purpose of this study was to evaluate the evolution of technical performance indicators over the course of football matches in the UEFA Champions League. Three elite football teams were the sample of the present study and were analyzed throughout four consecutive seasons within the previously mentioned competition. Data from 15 min periods were collected from Wyscout and elaborated. The effects of match location and competition stage were analyzed on nine technical indicators, including ball possession and variables related to offense and goal scoring. The effects of independent variables were assessed both independently and combined. The results showed a significant increase in the frequency of occurrence and accuracy of most of the parameters towards the end of the match. The effect of match location was generally significant with higher rates for teams playing at home. Differences were noted between the two stages of the competition with higher values in the technical indicators registered during the group stage. The existence of significant differences between the initial and final periods of football games was suggested by the results. The so-called home advantage was confirmed. Different team approaches between longer stages (e.g., group stage) and elimination games (i.e., knockout phase) were suggested by the results.

Stadium attendance demand in the men's UEFA Champions League: Do fans value sporting contest or match quality?

This paper is the first to empirically analyse the determinants of stadium attendance demand in the men's UEFA Champions League, the most prestigious competition in club football. The analysis covers 1,234 matches from 2009/10 to 2018/19 across 32 nations. The results show that outcome uncertainty and competitive intensity are not significantly associated with higher attendances, but the level of team quality is, for all fans, and the presence of star players is, for fans of clubs outside the top five European leagues. The empirical analysis-based on Tobit model regressions-enables an evidence-informed discussion of the competition structure of the UCL and the highly charged debate surrounding a potential European Super League. The article also offers insights for the wider body of academic knowledge on stadium attendance demand, by adding rare analysis of an international cup competition and an improved understanding of the connection between star players and fan interest in European football.

Match running performance characterizing the most elite soccer match-play.

In order to identify match running performance (MRP) characterizing the most elite soccer match-play, this study aimed to examine position-specific differences in the MRP of players competing in "big five" (BFLTs) and "non-big five" league teams (N-BFLTs). The data were obtained from 24 teams (BFLTs; n = 14, N-BFLTs; n = 10) during the UEFA Champions League (UCL) matches (n = 20) in the 2020/21 season using a semiautomatic video system. The differences in MRP between BFLTs and N-BFLTs, while controlling for contextual factors, were examined using linear mixed model. No differences in overall MRP between fullbacks, central midfielders, wide midfielders and forwards from BFLTs and their peers from N-BFLTs were found, while only central defenders from BFLTs covered more high-intensity running than central defenders from BFLTs (moderate effects size). For players on all playing positions from BFLTs, total- and low-intensity distance covered were lower in offensive phase of game and greater in defensive phase of game compared to their peers from N-BFLTs (all large effect sizes). This study demonstrated that the most elite match-play in soccer is characterized by increased efforts in defensive phase of game, and decreased efforts in offensive phase of game. Soccer training programmes should be adapted accordingly.

Factors affecting match running performance in elite soccer: Analysis of UEFA Champions League matches.

This study aimed to examine the independent effect of different match-related factors on match running performance (MRP) in elite soccer. Players' MRPs (n = 244) were collected during UEFA Champions League (UCL) group stage matches in the 2020-21 season. All MRP data were collected by the semi-automatic optical system InStat Fitness (InStat Limited, Limerick, Republic of Ireland). Match-related factors included match outcome, team quality, match location, opponent quality and difference in team quality, while MRP included cumulative and relative measures of total distance (TD and R-TD), low-intensity running (LIR and R-LIR) (≤ 4 m/s), moderate-intensity running (MIR and R-MIR) (4-5.5 m/s) and high-intensity running (HIR and R-HIR) (≥ 5.5 m/s). Linear mixed models were used to examine the collective effect of match-related factors on MRPs when controlling for between-player, between-playing position and between-team variation. The main findings were that match outcome was associated with reduced HIR (d = -0.38, p = 0.04), match location was associated with increased TD, R-TD, LIR and R-LIR (d = 0.54-0.87, all p < 0.01), while team quality, opponent quality and difference in team quality were not associated with MRP. These results show that (i) winning UCL matches was not strongly influenced by players' physical performance, (ii) away UCL matches were characterized by a slower match pace and greater match volume, and (iii) players' physical performance was similar irrespective of playing either in or against high- or low-quality teams. The findings from this study may help soccer coaches to ensure optimal physical preparation of players in elite soccer.

Forced to play too many matches? A deep-learning assessment of crowded schedule

ABSTRACT Do important upcoming or recent scheduled tasks affect the current productivity of working teams? How is the impact (if any) modified according to team size or by external conditions faced by workers? We study this issue using association football data where team performance is clearly defined and publicly observed before and after completing different activities (football matches). UEFA Champions League (CL) games affect European domestic league matches in a quasi-random fashion. We estimate this effect using a deep learning model. This approach is instrumental in estimating performance under ‘what if’ situations required in a causal analysis. We find that dispersion of attention and effort to different tournaments significantly worsens domestic performance before/after playing the CL match. However, the size of the impact is higher in the latter case. Our results suggest that this distortion is higher for small teams and that, compared to home teams, away teams react more conservatively by increasing their probability of drawing.

Home Advantage in International Club Organizations in Football: The Case of the UEFA Champions League, Europa League and Conference League 2021-2022 Season

Bu çalışmanın amacı 2021-2022 futbol sezonunda UEFA Şampiyonlar Ligi, Avrupa Ligi, Konferans Ligi organizasyonlarında oynanan grup müsabakalarında iç saha avantajını incelemektir. UEFA Şampiyonlar Ligi, Avrupa Ligi ve Konferans Ligi’nin her biri için 8 grupta 32 takım olmak üzere toplam 96 takım incelenmiştir. Takımlar grup sıralamalarına göre dört kategoriye (birinci, ikinci, üçüncü ve dördüncü sıra) ayrılmıştır. Her bir organizasyondaki takımların attığı ve yediği gol sayısı grup sıralamasına göre incelenmiştir. Atılan ve yenilen gol sayısının grup sıralamaları arasındaki ve iç ve dış saha müsabakaları arasındaki farklılığı, tek yönlü varyans analizi (ANOVA) ve ilişkili örneklemler için T-testi ile incelenmiştir. Analiz sonuçlarına göre, grup lideri olan takımların grup sonuncusu olan takımlara göre iç saha müsabakalarında daha fazla sayıda gol attığı belirlenmiştir (p&amp;lt;0.05). Ayrıca, grup lideri olan takımların grup sonuncusu olan takımlara göre UEFA Konferans Ligi hariç olmak üzere diğer organizasyonların iç saha müsabakalarında daha az gol yediği tespit edilmiştir (p&amp;lt;0.05). Tüm organizasyonlarda, grup ikincisi olan takımların dış saha müsabakalarına oranla iç saha müsabakalarında daha fazla sayıda gol atıp, daha az sayıda gol yediği belirlenmiştir (p&amp;lt;0.05). Sonuç olarak, UEFA kulüp organizasyonlarında iç saha performansının grup sıralaması bakımından ayırt edici bir faktör olduğu söylenebilir.

The effect of ball possession on physical and technical performance in UEFA Champions league matches

ABSTRACT This study aimed to examine the effects of low-percentage ball possession teams (LPBPT) and high-percentage ball possession teams (HPBPT) on the physical and technical performance of UEFA Champions League (UCL) players. All data were obtained from group stage matches of UCL during the 2020/21 season using a semi-automatic optical tracking system. Linear mixed model was fitted with contextual variables as covariates. Wide midfielders and forwards in LPBPT covered more total distance, low-intensity running, and achieved greater average speed than in HPBPT (all large effect sizes [ES]). Central defenders and fullbacks covered more high-intensity running (small ES), while CMs covered more sprinting (medium ES) in HPBPT than in LPBPT. Players on all playing positions produced greater number of passes and successful passes in HPBPT than in LPBPT (large ES), except forwards who produced more passes in LPBPT than in HPBPT (small ES). Both physical and technical performance were highly dependent on ball possession percentages, with evident position-specific changes, indicating that the effect of ball possession is highly position-dependent. These findings provide information for soccer coaches on physical and technical demands across teams with varying percentage ball possession, which could be used to individualise training programs based on playing style and position.

A paradox of tournament seeding

We analyse a mathematical model of seeding for sports contests with round-robin qualifying tournaments. The standard seeding system based on coefficients measuring the historical performance of the teams is shown to be unfair as it might potentially punish a team for its better results by having to face stronger opponents on average in the next stage. Major football competitions are revealed to suffer from this weakness. Incentive compatibility can be guaranteed by providing each qualified team with the highest coefficient of all teams that are ranked lower in its qualifying tournament for seeding purposes. Our proposal is illustrated by the 2020/21 UEFA Champions League.

How Do Player Substitutions Influence Men’s UEFA Champions League Soccer Matches?

Coaches’ player substitution strategies can change the tactical behavior and the final result of matches. This empirical study aims to describe the relationship/association of player substitution variables with the results of men’s UEFA Champions League matches during the 2018–2019 season. A total of 125 matches were analyzed using an ad hoc observation sheet created for this purpose. To measure the degree and strength of association between the variables studied, Chi-square and Cramer’s V tests were used, respectively. In turn, the Adjusted Standardized Residuals from the contingency tables were calculated to detect patterns of association. Likewise, a decision tree, in particular, the CHAID method, was used to predict and identify interactions. Player substitutions affect the final result and the findings prove it. An own team’s goal after 5–10 minutes of player substitution was win-related (positive impact) (90.40%, ASRs = 10.40), while an opposing team’s goal after 5–10 minutes of player substitution was loss-related (negative impact) (90.30%, ASRs = 10.30). Regardless of the match status, the positive impact increased the winning percentage. Furthermore, the match status was postulated as an indicator of the need to make player substitutions. It showed that player substitutions could determine the final result when teams were tying. On the other hand, the match location was not a differentiating factor between winning and losing teams, although the winning percentage was somewhat higher for home teams. Coaches could use this information to establish player substitution strategies that would allow them to perform at their best.

The influence of physical performance on technical and tactical outcomes in the UEFA Champions League

BackgroundTo clarify does physical performance affect success in highest-level soccer, the purpose of the present study was to identify differences in technical-tactical performance (TP) between teams covering high and low running performance (RP) during the UEFA Champions League (UCL) matches.MethodsThe RP and TP data were collected from UCL group stage matches in the 2020/21 season. RP variables included total distance covered (TD), high intensity running (HIR), total distance when in ball possession (TDB), and high intensity running when in ball possession (HIRB). TP variables included goal chances, shots, shots on target, passes, accurate passes, key passes, key passes accurate, crosses, crosses accurate, counter attacks, counter attacks with a shot, high pressing, high pressing successful, low pressing, low pressing successful, tackles, tackles successful, entrances to the opponent’s box, total actions, and successful actions. K-means cluster analysis method was used to classify teams covering (i) low and high TD, (ii) low and high HIR, (iii) low and high TDB, (iv) low and high and HIRB. Linear mixed models were used to identify differences in teams’ TP according to their RP. Pearson’s correlations were used to establish direct association between team TP and RP.ResultsSimilar TP were observed whether teams covering high or low TD/HIR. Teams covering greater TDB/HIRB had more goal chances, shots, shots on target, passes, accurate passes, key passes, accurate key passes, crosses, successful high pressing, entrances to the opponent’s box, total actions, and successful actions were observed (all moderate to very large effect sizes. Significant association between specific TP variables and TDB/HIRB were evidenced (Pearson’s r = 0.35–0.96, all p < 0.05).ConclusionCovering greater TDB and HIRB may allow more frequent execution of fundamental TP which are considered essential for match success, indicating that RP when team has ball in possession is important determinant of success in highest-level soccer. This study shows that physical performance affect success in highest-level soccer.

Match Running Performance in UEFA Champions League: Do More Successful Teams Really Run Less?

It is often hypothesized that more successful teams from elite football competitions achieve lower match running performance (MRP) than less successful teams. However, the results of previous studies investigat- ing the associations between MRP and different success indicators are inconsistent. The main objective of this study was to identify the association between teams’ MRP and the UEFA club coefficient as an indicator of long-term success in highest-level football. Individual MRPs (n=547) of 378 outfield players were jointly evaluated into the team MRP and used as cases in this study. All data were collected by the semi-automatic optical video system InStat Fitness from matches (n=20) of the UEFA Champions League group stage (UCL) in the 2020/2021 season. MRP variables included total distance covered and distance covered in different speed zones: walking (&lt;7.1 km/h), jogging (7.2–14.3 km/h), running (14.4–19.7 km/h), high-speed running (19.8–5.1 km/h), and sprinting (&gt;25.2 km/h). Pearson’s correlation coefficient was used to identify the association be- tween the teams’ MRP and the UEFA club coefficient. Results indicated that the UEFA club coefficient was positively and negatively associated with sprinting and jogging distance covered, respectively. These findings show that teams with a higher UEFA club coefficient performed a lower amount of running at low intensity and a greater amount of running at maximal intensity, suggesting that teams are achieving greater long-term success in highest-level football play at a higher game pace.

Decline in Running Performance in Highest-Level Soccer: Analysis of the UEFA Champions League Matches.

Simple SummaryHighest-level soccer players reduce match running performance towards the end of matches, with TD being greater reduced than HIR. As players do not reduce their MRP in the latest stages of the second half, and that influence of situational factors was not observed, it seems that the decline of match running performance in highest-level soccer may not be a consequence of fatigue or situational factors but of pacing strategies.It is widely recognized that there is a decline in match running performance (MRP) towards the end of matches. To clarify whether it is primarily a consequence of fatigue, pacing or situational influences, this study aimed to examine MRP across 15-min match periods for players on different playing positions. Players’ MRP (n = 244) were examined from the UEFA Champions League matches (n = 20) using a semiautomatic optical tracking system. Linear mixed models for repeated measures were adjusted to analyze MRP over the six 15-min match periods while controlling the influence of situational factors. No effects of match outcome, match location, team, and opponent quality on total distance (TD) and high-intensity running (HIR) for players in all playing positions were found (F = 0.03–2.75; all p > 0.05). Significant differences in TD (F = 17.57–53.01; η2 = 0.39–0.52, all large effect sizes) and HIR (F = 3.67–7.64; η2 = 0.05–0.19, small to medium effect sizes) among six 15-minute match periods were found for players in all playing positions. In addition, players in all playing positions covered less TD (d = 1.41–2.15, large to very large effect sizes) and HIR (d = 0.16–0.6, trivial to medium effect sizes) in the last compared to the first 15-min match period. No differences in TD and HIR between the last two match periods in the second half were observed. This study confirmed that soccer players reduce MRP towards the end of matches, and suggest that the decline of MPR in highest-level soccer may be a consequence of pacing strategies.

Information Model Development – Attributes and Power of Information

Starting from the general concept of a system-process, which is defined by the quality of relations between individual elements, we can single out attributes whose elements have a dominant character of the information system, all in the projection of the quality of the observed process. In any state of the process, information is undoubtedly significant as a subsystem, whose property cannot be ignored, because it is a dynamic process that bases its dynamism in the time domain. The paper precisely defines the information power model as well as its response to the occurrence of perturbations in a strictly defined time domain, all in the function of one process-event. The described complexity can be a function of horizontal complexity, whereby a hierarchical component is frequently lost, or it can be another component resulting from the overall information process. The paper deals with measurements of the response to an event that took place at the global level, that is, the finals of the UEFA Champions League 2021. A unique functional relationship of power of information in strictly defined marginal conditions was obtained. The paper presents the spectrum of the power of occurrence-opening of the portal of the mentioned event through the functional relationship of the dynamic process. All the described phenomena gave new insights in the development of the information model.

A comprehensive approach to predict auction prices and economic value creation of cricketers in the Indian Premier League (IPL)

The Indian Premier League (IPL), the most successful cricket tournament in India, has immensely grown in popularity. Unlike similar tournaments like Major League Baseball and the UEFA Champions League, their models cannot be replicated due to the dynamic pricing nature of player auctions. The research intends to generate a predictive model that predicts the auction price of a player using key quantitative variables. The players were categorised by batsmen, bowlers, and all-rounders. Due to the holistic hedonic nature of the model, equations were formed to predict a player’s future performance, in terms of measurable points, and to extrapolate economic value creation given a budget constraint. This study provides insights on the player’s economic value by comparing the auction price paid vs. the player’s actual performance. This new approach to modelling in cricket games not only aims to produce more accurate results using the hedonic pricing method, but also enlightens an introduction to a more holistic modelling process to intricately understand the profiting avenues for team owners to reverse-engineer value additions of players at each level and position. Finally, this model, which considers the factors an IPL franchise would, is being designed to be utilised in future IPL auctions.

The effect of team formation on match running performance in UEFA Champions League matches: implications for position-specific conditioning

ABSTRACT This study aimed to determine the effect of team formation on position-specific match running performance (MRP) at highest-level football. Players’ MRP (n = 226) was observed in four team formations: 3-5-2 (n = 24), 4-4-2 (n = 44), 4-2-3-1 (n = 77) and 4-3-3 (n = 81). Central defenders in the 3-5-2 formation achieved a greater amount of high-intensity running distance than in the 4-3-3 formation (mean difference (MD) [95% confidence interval] = 144 m [12, 267], medium ES). Fullbacks in the 4-4-2 formation covered less total distance than in 3-5-2 (MD = −762 m [−1431, −94], large ES) and 4-2-3-1 (MD = −662 m [−1055, −269], medium ES). Central midfielders’ total distance in the 4-4-2 formation was lower than that in the 3-5-2 (MD = −645 m [−79, −1211], medium ES) and 4-3-3 (MD = −656 m [−1181, −132], medium ES) formations. Wide midfielders’ walking distance in the 4-4-2 formation was lower than that in the 4-3-3 (MD = −484 m [-742, -226], very large ES) and 4-2-3-1 (MD = −535 m [−789, −282], very large ES) formations. Forwards’ high-intensity running in the 4-2-3-1 formation was lower than that in the 4-3-3 (MD = −363 m [−613, −112], large ES) and 4-4-2 (MD = −396 m, [−688, −103], large ES) formations. These findings show that conditioning programs for players on all playing positions should be tailored according to the formations of their teams.

On competitive balance in the group stage of the UEFA Champions League*

AbstractThis article examines competitive balance in the group stage of the UEFA Champions League over the last two decades (1999/2000–2017/2018). Competitive balance is considered both before and after a competition. Have the groups been designed in such a way as to ensure similar levels of competitive balance ex ante? Have the demonstrated strengths (ex post competitive balance) of the different groups been similar over each season? What is the relationship between the competitive balance in the designed groups and that achieved in the same groups after the competition? Are the performance achieved in terms of ex post competitive balance similar to ex ante competitive balance levels? We found that, despite expectations, the groups' ex ante competitive balance was not homogeneous. Although ex ante competitive balance serves as a good predictor, on average, of ex post competitive balance, we observed significant differences at the levels of group and seasons. Therefore, it is possible to improve the design mechanism of the groups that make up the group stage of the champions so that they are composed homogeneously in terms of ex ante competitive balance.