Ibrahimovic, who scored 50 goals in all competitions for Paris Saint-Germain last season, is gearing up for his maiden Premier League campaign after joining United on a free transfer this summer.
But Wenger is unsure whether the Swede, who turns 35 in October, will flourish in England.
"Honestly I don't know [how "Going for him is his class, his talent, his desire to do well. What goes against him is that he is not the youngest player anymore, so you are questioned about that in every game.
"From what I saw of him last year at Paris Saint-Germain, it was his most complete season as an individual player and as a team player. He became a really great team player last season.
"On the mental aspect he will bring something to Man United as well. He is a winner, he has charisma and he will give them a strength as well as his individual quality."he will get on]," Wenger told Arsenal's official website