The Argentine, who made 18 appearances for the Royals last campaign, admitted that he had doubts whether his career at the Emirates will ever take off, but he decided to fight for his place.
"I had a great season on loan at Reading and I had offers to leave Arsenal," he told the Arsenal En America podcast. "I wanted to play, it was going to be my priority. After nine years without much rhythm I wanted to leave.
"But I got the news that I was going to play more games and I decided to stay to try to be number one. I'm very prepared. If I didn't believe myself of being capable of taking that position, I would not have stayed.
"I know that the national team's goalkeepers coach has followed me last season at Reading and wants me to play. That's why having good games at Arsenal, which is one of the best clubs in the world, I will have the possibility."