Laurent Koscielny has picked up a minor Achilles tendon problem while training with France - adding to Arsenal's injury problems.
The 29-year-old is however expected to be fit for the Gunners' next match - at home to Hull on 18 October.
Team-mate Mesut Ozil was ruled out for between 10 and 12 weeks on Wednesday after the knee injury picked up on club duty was assessed by Germany staff.
Midfielders Aaron Ramsey and Mikel Arteta have missed the last two games.
Ramsey is set to miss the next three-to-four weeks as he continues his recovery from a hamstring strain, while Arteta could return after the international break after a calf problem.