“He is expected to be out for 21 days. We are a bit short at the moment but we have young players who can do well, the Frenchman told reporters.
The Wales international picked up the injury in third-placed Arsenal’s surprise 2-1 home defeat by Watford on Tuesday.
Arsenal have a Champions League last-16 clash at Bayern Munich on Feb. 15.
The Gunners need a victory at Stamford Bridge in Saturday’s lunchtime kickoff to reel in Chelsea, who will take a 12-point lead if they win.
Wenger said striker Olivier Giroud, who picked up an ankle knock on Tuesday, should be available.
(Reporting by Alan Baldwin, editing by Ed Osmond)
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