Development squad members Miro Muheim and Ali Suljic are leaving Chelsea.
Winger Muheim, 19, and defender Suljic, 20, were both part of the Blues’ Uefa Youth League-winning squad in 2015-16.
Muheim is returning to his native Switzerland to join St. Gallen, while Sweden youth international Suljic has had his contract cancelled.
Meanwhile, Charlie Colkett has returned from his loan spell at Vitesse Arnhem.
The midfielder made 11 appearances, including three in the Europa League, during an injury-affected spell with the Dutch club.