Drogba heads for clash with Chelsea over injury

Didier Drogba's desire to play in next month's African Cup of Nations may set him and his country on a collision course with Chelsea. The striker has a chronic knee condition which would benefit from surgery and, although he has played through the pain for at least 12 months, Ivory Coast fear that the club will press him to have the operation after the turn of the year when they are due to lose him anyway to international duty.