"He first dislocated it on December 20th when Chelsea beat Fulham 1-0, and was out for three-and-a-half weeks. He is having an assessment made of the problem before deciding what rehabilitation is for the best.
"Damien was back in full training after a virus had kept him out of the last three games."
The news will come as a huge blow to Claudio Ranieri, who's Chelsea side have yet to win since beating Arsenal in the Champions League. With a Champions League semi final second leg to play next week, and a match at Old Trafford a few days later, the injury couldn't have come at a worse time/
Let's hope that the club sort this problem out by allowing Duff to have surgery, which should keep the problem in check for a lot longer than resting would...