Wenger expects the France striker to be back to his best very soon.
"He was a bit behind at the start. Fitness-wise he has been behind Koscielny and Ozil. At the start it took him some time to get back. Since the last week, he's slowly getting back to full fitness now.
"I think he got a bit of a sceptical attitude from France fans before the competition.
"During the competition he convinced everybody that he was the right choice."