Updated

Greek teenage star Konstantinos Karetsas was stretchered off the pitch after collapsing with 'circulatory problems' during Borussia Dortmund's Champions League match against Villarreal. The incident halted play and drew widespread concern from fans and players. Karetsas was taken to hospital for further evaluation, with details of his condition still emerging. The episode has raised renewed attention to player health and medical protocols during high-intensity European competition.