Chelsea manager Avram Grant has confirmed that Didier Drogba may require surgery on his troublesome knee injury and the striker looks certain to miss this weekend's Premier League clash with Sunderland.
The 29-year-old Ivory Coast international has been troubled by the problem for much of this season, and has started only ten Premier League matches so far in 2007-08.
Grant told the Blues' official website: "We are keeping an eye on the situation and we will know better in the next few days.
"We are doing everything. We are talking with the player and, in the last one or two months, we knew that he had a problem sometimes but he always pushed to play.
"He pushes to play even now but we must take care of the health of the player.
"We will see what is good for him. At the moment we will keep an eye on the situation and then we will know what will happen."
After confirming that Drogba is 90 per cent certain to miss the Sunderland game, Grant said that the striker could return to action before Christmas.
He added: "It depends how he feels. If he feels good, he will play. He always pushes to play but again, it depends if he can or not."
Meanwhile, Petr Cech will return to full training next week following a calf injury.