Ozil is out of contract at the Emirates this summer and has yet to sign an extension at the Emirates.
Jose Mourinho previously worked with the midfield maestro when he was in charge at Real.
He said: “I think he would have to change his attitude. I think it's mainly when the team loses the ball.
“The first few seconds in reaction – that's when the coaches want you to get up and try to recover as quickly as possible.
“Be that man to block and try to stop your opponent.
“And his transitions sometimes, he looks like 'okay we lost the ball now and I've got to run back now because I'm Arsenal', but sometimes it doesn't look like he is interested, so at United he wouldn't last long – especially with Jose [Mourinho]."