Arteta said: “He is a player that I really liked since the first day I watched him. Just the way he moves, how intelligent he is with the positions he takes and his work rate – don’t underestimate that.
“He works really hard for the team and he had a really bad injury this year and hasn’t really trained with us at all.
“For the last two weeks he has been much more involved and you can see what he can bring to the team.
“I am delighted to have a young player with his talent and in that position. It was something that we needed.”
Arsenal return to action this lunchtime when they take on Southampton in the FA Cup.