PurposeThis study aims to investigate the effects of sponsorship on organizational identification among employees of companies that sponsor individual athletes from the perspective of internal marketing.Design/methodology/approachAn online survey was conducted in July 2021 targeting employees of Company A. Specifically, employees were invited to participate via email notifications sent through the company's intranet. To clarify the impact of company sponsorships for individual athletes on employee organizational identification, this study focused on the relationship between Company A and an athlete they support. Psychometric scales were used to measure the factors of the hypothetical model, such as sponsor fit and attitudes toward sponsorship. The analysis was conducted using IBM SPSS 28.0 and AMOS 25 Graphics, and the hypotheses were tested using structural equation modeling.FindingsWe collected a total of 365 survey responses in two weeks. All the hypotheses in this study were supported, indicating that athlete identification and brand knowledge had a significant positive effect on perceived sponsor fit. In addition, attitudes toward the employer significantly have positive relationships with brand commitment and organizational identification. This study showed that perceived sponsor fit plays an important role in employee perceptions of sponsorship. Athlete endorsement is effective from an internal marketing perspective.Research limitations/implicationsThe limitation of this study is the selection of the research subject. Conducting the same survey targeting individual athletes with different characteristics may lead to discoveries about the impact of corporate sponsorship on employee organizational identification.Practical implicationsThe practical implication of this study is that business executives should also use sponsorship for individual athletes as a means to unify and motivate their employees. In selecting athletes for sponsorship, it is necessary to select individuals who fit the company image. In this process, listening to employees' opinions may help select the most suitable athlete who matches the company's image.Originality/valueMany studies conducted on sports sponsorship have focused on the impact on potential customers, from external marketing. Even in studies examining the effects of sports sponsorship on employees, the sponsored subjects are typically teams or events. Therefore, the originality of this study lies in examining the impact of athlete endorsement on the company's employees from the perspective of internal marketing.