Former Manchester United midfielder Paul Ince is amazed by the form of David Luiz under Arsenal manager Mikel Arteta.
Ince has praised Arteta for getting the best out of the centre-back.
He said: "You look at David Luiz, he was terrible under Unai Emery.
"You look at him now and all of a sudden leadership he's pulling people in saying well done, well done.
"He wasn't doing that before, he looks like an impostor now.
"But this is what Arteta demands from him, if you are going to be in that central role you are going to have to show leadership.
"That's what he's doing. It's not just the work they are doing on the pitch it's what goes on off it too. When it all comes together you will see a proper Arsenal team."