The Gunners allowed a two-goal lead in a meeting with Schalke on Tuesday to slip through their grasp, but a 2-2 draw in Germany keeps them on course for the knockout stage.
It is possible that victory over Montpellier on Matchday Five will see Arsenal through, and Wenger is looking for his side to secure their safe passage through Europe's premier club competition as quickly as possible.
He said: "The group is open. I believe we are of course in a position where you want to win our home game.
"If we win, we have a 50 per cent chance to be through because Schalke plays Olympiakos here. They are in a position where they have absolutely to win that game as well.
"It will of course depend on our result first against Montpellier and then we will see what happens here.
"It could go to the last game; we could, with luck, do it in the next game. Anyway, we are in a position where we must win against Montpellier."