Big if but IF he could ever recover to full fitness he would definitely be Arteta's 9 in the big games over Gyokeres.
He is also fine as the 10 ie the right 8 and in the 2 when pressing and works well with Gyokeres upfront.
He shouldn't be played as the left 8 and in the 4 when getting back into shape as he isn't making it back in time from all his space finding missions.