Michael Ballack says Mesut Ozil does not have the tenacity of a fighter which prompted his exit from Real Madrid and still has not been able to respond positively with the challenges at Arsenal
25 year-old Ozil made an Arsenal record transfer move from Real Madrid with the expectation that he would help the club’s frontline attack
However, after a few games in the new season, the German international has failed to impress, performing poorly in the 2-0 loss to Borussia Dortmund in the Champions League on Tuesday
A former Germany international Michael Ballack has described the player as slow in spirit and a small fighter
In an interview with Sky Sports, Ballack said: "What's happened with him? I don't know.
"There must be something behind [the scenes] because his head is mostly down, the body language is not improving even with the world champion [medal] in the pocket.
"I don't really know what's happened over the last year since he moved from Madrid to Arsenal.
"A player like him with his ability should have tried to stay longer at Real Madrid. That is my opinion. You could see there was a little bit trouble, a little bit moaning. He played well but you need time to adapt at a club.
"If there is some ups and downs [at a club] you need to fight these things.
"And now it's a little bit the same situation. He got criticised here [at Arsenal], he's not at his best but I don't see a reaction.
"A player like him with his ability should show a reaction but he never was the strongest player in terms of fighting, body language.
"That's his weakness - especially in these situations now when he can't use his technique and his vision."
37 year-old Ballack urged Arsenal fans to be patient with Ozil, citing Wenger’s confidence in the player
"When you a buy a player like Ozil you know his strengths and Arsene Wenger knows, I think, where he is at his best.
"If he [Wenger] thinks he can help the team more as a No.10 I think he would put him at No.10.''