The 20-year-old signed for the Gunners in 2011 and plied his trade in the youth team and on loan at Watford.
But this season, the young right-back has been revelation for manager Arsene Wenger, taking his first team opportunity due after an injury crisis and establishing himself in the side making 18 appearances in all competitions.
Following his success, the Spaniard believes that if he stayed at the Nou Camp, he may not have gotten a chance.
Newspaper Review - Monday 30 March
He told Marca: "I got the chance and I took it. Wherever you are, you have to work.
"If I'd stayed at Barcelona, I don't know if I'd have made it to the elite, you just never know.
"I've worked as hard as I could and always had the mentality of reaching the top. Whether I was in one place or another, I'd have done the same."
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