The Chelsea F.C. is a soccer team.
Association football , more commonly known as football or soccer , is a team sport played between two teams of eleven players with a spherical ball . Chelsea F.C. . Their average home gate for the 2016 -- 17 season was 41,507 , the sixth highest in the Premier League . The Premier League is an English professional league for men 's association football clubs . The UEFA Champions League is an annual continental club football competition organised by the Union of European Football Associations ( UEFA ) and contested by top-division European clubs .