Didier Drogba, Florent Malouda, John Obi Mikel, Jose Bosingwa and Yuri Zhirkov could all leave the Blues this summer.
A Chelsea source confirmed to The Sun: “There are a few big names and big earners whose performances have fallen short this season.
“If things don’t improve there will be some notable casualties in the summer.
“The competition for places will be keener now and that should be a great motivation for everyone.”
