Last season he made the Gunners' starting line-up only once.
Vela said: "It was difficult for me. I didn't have many opportunities when I was fit.
"Then, injuries didn't allow me to be in good form. But I still have time to get ready for the World Cup."
He said: "I'm only concentrating on playing for Mexico and having a good World Cup. Having a good World Cup can open many doors. If not at Arsenal, we'll see where."