Arsenal defender Mertesacker: My mate Ozil will prove bargain buy
Mertesacker, Ozil's national team-mate, said he will make a "massive" difference to Arsenal's season and has invigorated the squad.
"I think he is worth what we paid for him," Mertesacker told the Daily Mail.
"He is a phenomenal player and I think he has not reached his best at the moment. I think his contribution to this club will be massive."
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