From TheChels.info - The Chelsea Football Club Wiki
First team squad
The current first team squad.
Players who have made a competitive first team appearance for Chelsea, by surname.
Chelsea's Development squad.
Youth team squad
Members of Chelsea's youth team.
Wartime guest players
Players who appeared for Chelsea as guests, during wartime competitions, but never made a competitive appearance for the club.
Chelsea Ladies squad
The Chelsea Ladies squad.
Chelsea Old Boys
Players who represent the Chelsea Old Boys side.