The Italian has impressed in keeping two clean sheets against Stoke and Liverpool and the manager admits the stopper has given him food for thought.
Wenger said: "He has done really well. Vito was allowed to move at the start of the season, to play somewhere.
"Now he has been No 1 for two games and has at least moved into being a serious candidate to be fighting for the place. At the moment, Wojciech (Szczesny) is but there is a fight there and it is interesting.
"We have three goalkeepers who have the talent to play in the Premier League and to fight for the No 1 place. That's Wojciech, Fabianski and Mannone.
"Usually we keep two and let one go away to play, because they need to play. Now Vito has taken advantage of the fact that Fabianski and Wojciech were injured."