Blues wait on Terry
John Terry returned to training on Thursday but is still a doubt for Saturday's Barclays Premier League clash at Aston Villa due to a back problem.
Terry sustained the injury on international duty with England and was forced to withdraw from the squad which drew 0-0 with Montenegro in Tuesday's Euro 2012 qualifier at Wembley.
A final decision on the former England captain's participation at Villa Park will be taken after training on Friday.
Dutch centre-half Jeffrey Bruma, who withdrew from midweek action with the Holland Under-21 side due to a tight hamstring, also took part in training on Thursday and could be in contention.
If Terry is ruled out it would leave Chelsea manager Carlo Ancelotti with a defensive headache against Villa.
The circumstances could prompt first-team recalls for Jose Bosingwa and Paulo Ferreira.
Right-back Bosingwa has not played since the defeat at Villa last October after sustaining a knee injury that later required surgery.
Ancelotti could move Michael Essien or Ferreira alongside Branislav Ivanovic in the heart of the defence, with Bosingwa at right-back.
Ferriera is ready for the challenge as Chelsea, who should welcome back England midfielder Frank Lampard after a groin strain, look to maintain their four-point lead at the top of the Premier League standings.
"Last season I didn't play much but the games I had I tried to give everything and I finished the season well," the 31-year-old said. "This season I am enjoying it a lot, working hard and always ready to play if the manager wants. I've had chances to play and given 100% and tried to help the team."