The Chelsea F.C. is a team that plays soccer.
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 Football Club ( [ ˈtʃɛlsiː ] ) is an English professional football club based in Fulham , London , that competes in the Premier League , of which they are reigning champions . Chelsea have won six national league titles , seven FA Cups , five League Cups and four FA Community Shields , one UEFA Champions League , two UEFA Cup Winners ' Cups , one UEFA Europa League and one UEFA Super Cup . The club have the sixth-highest average all-time attendance in English football . In 2016 , they were ranked by Forbes magazine as the seventh most valuable football club in the world , at # 1.15 billion ( $ 1.66 billion ) .