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Watch Standard Liege vs Red Bull Salzburg Live StreamingWenger, though, insists being low on numbers should not be an issue for the Barclays Premier League side, who did not have a game at the weekend.
"It is difficult to say how long they will be out," said the Arsenal manager. "But it is not a serious concern.
"The concern is that the players who are here perform at their best.
"It is part of the season that you do not always have all the players available to select the team but I am not bothered by that."
With Gallas unavailable because of a calf problem, veteran former skipper Sol Campbell could be in line for his first European appearance with the Gunners since leading them in the 2006 Champions League final against Barcelona.
The 35-year-old has been used only twice since securing a shock return to the club he captained to so much success along with the likes of Thierry Henry and Patrick Vieira.
Wenger believes former England international Campbell still has plenty left to offer.
"Sol's experience can be important," said the Arsenal manager.
