Maybe he's more suited to be more offensive, but iirc he really didn't like playing anywhere else but FB at Valencia. Even at Inter Spalletti tried him as a winger and he only started playing well when switched back to FB.
Maybe it's mental. But I remember Allegri saying he needs more depth when attacking as in he's not used to usual winger movements where they often have to receive the ball with their back to the goal, find space, turn and then attack.