Wenger says the goal will give the French striker a much-needed confidence boost.
Wenger said: "It was in everybody's mind that the sooner he gets it the better. Certainly in his mind much more than in others' minds. That is positive of course. It was a good finisher and he is a good finisher, Olivier. At the moment I believe he is looking for confidence again and that goal will help him. I expect him to take that confidence into the Premier League."