Maresca's balancing actpublished at 09:07 British Summer Time 19 August
Chelsea 0-2 Man City
Chelsea have spent about £185m on 11 signings this summer, adding to a squad that was already considered large.
Academy products Conor Gallagher and Trevoh Chalobah and striker Romelu Lukaku, who cost them £97.5m three years ago, are all training away from the first team.
Chelsea accepted a £33m bid from Atletico Madrid for Gallagher, who captained the club in 24 Premier League games last season.
However, he has been unable to complete his move for now after a deal for striker Samu Omorodion to go in the opposite direction collapsed.
Chalobah is being linked to several Premier League clubs, while manager Enzo Maresca has told England left-back Ben Chilwell that he is allowed to leave this summer too.
Midfielder Carney Chukwuemeka and defender Axel Disasi were among the other players, apart from Raheem Sterling, left out against Manchester City on Sunday.