Gallas has been a regular for Arsenal this season
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Arsenal will be without William Gallas for a "few weeks" after the defender injured his thigh in training.
Gallas' injury comes on the eve of the Gunners' Champions League clash against Hamburg, with Philippe Senderos or Johan Djourou now set to replace him.
"We lost Gallas in the final shot of the training session," said Wenger.
"He's bruised his thigh and will be out for a few weeks. It's a blow because he stabilises our defence. It's a good chance for a young player to come in."