Arsenal captain William Gallas will be sidelined for up to three weeks after injuring his groin in the draw with Blackburn on Sunday.
The French defender had to be replaced on 24 minutes by Philippe Senderos after a heavy challenge from Blackburn's Roque Santa Cruz.
"He has done his groin, I knew it straight away," confirmed Arsène Wenger in a post-match interview.
"He will be out for three weeks."
Gallas will miss France's friendly against Slovakia on Wednesday, and will struggle to recover for Arsenal's important Champions League qualifier with Sparta Prague.
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