Abstract Issue/problem In Europe, 9 million young people (10-19) suffer from mental disorders and 70% of children and adolescents with mental health problems do not receive appropriate interventions at a sufficiently early age. Moreover, during the Covid-19 pandemic a high prevalence of depressive symptoms, anxiety and sleep disorders was observed in the population aged 4-19 years. The Icehearts Europe project (funding: EU4Health 2022 Programme) aims to disseminate at EU level a long-term programme for supporting health and wellbeing of disadvantaged children and adolescents. It is inspired by the Finnish best practice Icehearts, a 12-year long mentoring programme. Five pilot countries (Italy, Denmark, Spain, Slovenia, Estonia) will test the model to raise European awareness of how it works and to get more countries and organisations involved. Description of the problem Icehearts Europe is a preventive mentoring programme based on team sports, recreation and school support activities, with a child-centred community approach. To facilitate its implementation, a practical guide has been developed for grassroots sport and social promotion organisations to help them implement the model in their own contexts. The guide is the result of both a multisectoral cooperation between grassroots sport, health, universities, NGOs, and qualitative study activities (bibliographic research, study visit, group work, analysis of the situation and needs of local contexts). Results From February 2024 the Icehearts Europe Implementation Guide is available in six languages at https://www.icehearts.eu/resources. It is now being adapted by the Icehearts Europe partners into an online training programme for managers. Lessons The guide has incorporated lessons learnt from the Finnish model, considered as an evidence-based approach. It contains several operational tools to implement Icehearts Europe and can be adopted using different approaches: there is no one-size-fits-all solution. Key messages • Developed as a support to the Icehearts Europe piloting partners and as a basis for a fully-fledged online training programme for future Icehearts Europe managers. • To facilitate the implementation of early interventions to promote health and wellbeing of children and adolescents and enable them to cope with disadvantaged conditions.