The 31-year-old Spaniard got the damage in preparing however chief Arsene Wenger is still to uncover the full degree of the issue.
"It could be with the assumption that six weeks, however we don't know yet," he said. "We need to check the intensity with the specialist."
Thomas Vermaelen and Nacho Monreal both have back issues and will likewise miss the period opener against Aston Villa.
On the other hand, both forward Theo Walcott (knee) and midfielder Aaron Ramsey (lower leg) could offer in Saturday's match.
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