Vela is currently on-loan at Spain's Osasuna and Wenger told arsenal.com: "We scout him every week when he plays.
"He can apply for a passport in March and normally he will start with us next summer.
"He will straight away be with the first-team and after that it is up to him to get a place in the side.
"I sent him to Spain because he comes from a Mexican culture and it is easier to adapt in Europe. He has what we like here at Arsenal. He is a good passer of the ball and a finisher. He has that intelligent movement with very good technique and great pace."