Ozil joined the Gunners in a €47million deal on transfer deadline day.
“I think that Arsene Wenger will get the best out of him,” Mertesacker said. “I think he will fit in.
“He suits us and we’re really looking forward to playing with him and to be his team mate.
“We need players in every position – maybe two or three players, they can rotate and change position.
“We need to be dangerous up front and with him we are more dangerous.”
Mertesacker and Ozil played together at Werder Bremen earlier in their careers.