Kolo Toure, Emmanuel Eboue and Alex Song are all away at the African Nations Cup.
Wenger, though, refuted suggestions his squad was in need of reinforcements.
"I don't look for anybody," insisted the Arsenal manager.
"The last excuse you should look for when a team that has won many games this season doesn't win is to say you should buy players."
Wenger maintained: "I don't think we missed Kolo either: Philippe [Senderos] wasn't involved in the set-piece for the goal.
"We just didn't defend it well and that's how we were punished."