The Costa Rican is enjoying life in Spain, and talked up the possibility of remaining at the club.
"I feel very comfortable and have identified with the team and people of Betis," he told eldesmarque.es.
"I love the city, and if I have to stay I am available. Hopefully we will be in Europe too."
However, the 20 year-old admitted the going back to the Gunners would not necessarily be a bad thing.
"I do not deny that I would love to show what I have in a team like Arsenal," he added.