Chelsea's oversized squad has been the subject of criticism and led to them being accused of "recruiting badly" by pundits.
There are 42 first-team players listed on the club website but many haven't been seen in training, with manager Enzo Maresca fielding questions about their futures throughout his two-month spell at Stamford Bridge.
He left Raheem Sterling, arguably the club's most famous player, out of his first Premier League squad in the 2-0 home defeat by Manchester City on Sunday.
England midfielder Conor Gallagher has left for Atletico Madrid - in an unpopular move with some sections of the fanbase - with fellow home-grown star Armando Broja set to join Ipswich in a loan move with an obligation to buy.