Chelsea's Under-21 side competes in the Barclays U21 Premier League and the U21 Premier League Cup...
Chelsea's Under-21s, Under-19s and Under-18s make up the development process for young players at the club.
Replacing the old reserve league, a new Under-21 nationwide league was introduced for the 2012/13 season. Rather than seasoned professionals not currently selected for the first team, the Under-21 side is more likely to be young players looking to press for a first team breakthrough or a chance to gain experience on loan with another club.
However a small number of 'over-age' players can be selected so on occasions established first team squad members will be given Under-21 outings, especially when coming back from injury or in need of match fitness. Players who have done well in the youth team will be given the chance to test themselves against older opposition while still eligible to play for both sides.
Find out more details about each age group below...