Chelsea's Under-21s, Under-19s and Under-18s are the later stages of 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.

New knockout competitions for this age group have also been recently incorporated into the fixture schedule.