The Spain international has had another fine season as the Gunners challenge for the title and FA Cup, and he signed a new contract on Tuesday.
"I'm very happy at the Club, being able to stay here and sign [a new] contract - it's great to get it sorted," he told Arsenal Player.
"I like being here, I'm happy and I think that the Club can be a big player in competing for the top trophies in years to come. That's important for me.
"One of the main reasons for coming here was to get better as a player and joining Arsenal has definitely made me a better player."
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