Mason Mount, N’Golo Kante and Jorginho are among those Chelsea fear could leave in a potential player exodus, according to The Sun.
The contracts of both Kante and Jorginho expire next summer and there is speculation that Chelsea could lose them if they cannot tie them to new deals this year.
The Sun also suggests there is potential doubt too over the future of Mount, whose contract expires in 2023.
Reports have recently claimed that Mount could end up leaving Stamford Bridge if the club do not secure his long-term future there.
It comes with Antonio Rudiger and Andreas Christensen set to leave the club at the end of the season when their contracts expire.
It has already been confirmed that Rudiger will move on after rejecting a new deal.
And Christensen, meanwhile, has been heavily linked with a move to Barcelona.
Speaking at a recent press conference, Blues boss Thomas Tuchel made it clear he wanted the futures of Kante and Jorginho to be resolved this summer in order to avoid a repeat of the long-standing uncertainty over Rudiger and Christensen.
Tuchel said: “Nobody wants that (uncertainty) with players, especially big and important players. It is important that we solve this in the summer so that it is clear where the journey is.
“At the moment it is difficult to handle anything. But yes, of course, this should be the target for us.”