The midfielder has been linked with a move away this season.
But he says: "I feel better now, my Spanish is improving, although I cannot yet express myself fully. Settling in at the club was easy, which made my life easier and I'm very happy in this team and this city."
On his former Arsenal teammate Cesc Fabregas adds: "He's like a brother. He reached out to me, showed me the ropes and I immediately felt better."
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