Arsenal defender Bacary Sagna has been ruled out for at least three weeks with an ankle injury.
The 25-year-old France international scored the Gunners' only goal in the 2-1 loss to Chelsea before limping off in the 72nd minute.
Arsenal manager Arsene Wenger said: "The first news that we have is that he could be out for quite a while.
"I have seen it again. He wanted to kick the ball out and he twisted his ankle. That made it a bad injury."
Sagna is now likely to miss Arsenal's triple header with Liverpool in the Premier League and Champions League at the beginning of April.
He could also miss the Gunners' crucial trip to Manchester United on 13 April.
The right-back has featured on a regular basis for Arsenal this season after signing from French side Auxerre in the summer.
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