Arsenal manager Arsene Wenger revealed his concern over Abou Diaby's ankle injury, admitting he is not sure when the midfielder will be able to play again.
The 24-year-old has been out of action since October 16 after failing to fully recover from the effects of a crunching challenge by Bolton defender Paul Robinson the previous month.
"He was never himself and we have worries for him. We don't know how long he will be out," said Wenger.
Diaby suffered a broken leg and a dislocated ankle against Sunderland in May 2006, but returned to become a key member of Wenger's side.
However, Wenger feels the France international could be set for another long spell on the sidelines.
"You look at Diaby since he got this tackle (from Robinson), he has never come back to a normal level," Wenger said.
"He has seen two surgeons already and at the moment we have to be patient to see if he can get away with it."
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