Chelsea's Pierre-Emerick Aubameyang is set to join Marseille on a free transfer, while Marc Guehi could reunite with the Blues.
Brighton have rejected a second bid from Chelsea for star midfielder Moises Caicedo.
Chelsea defender Wesley Fofana has undergone reconstructive surgery on his anterior cruciate ligament.
Chelsea have made it clear to potential suitors, including Marseille, that they do not want striker Pierre-Emerick Aubameyang to leave on a free transfer.
Christian Pulisic has joined the growing number of players to leave Chelsea this summer after completing a move to AC Milan.
Frank Lampard has revealed he was keen to bring Declan Rice to Chelsea as a potential long-term captain for the Blues.