Sahin insists he will not allow his good friendship with former Madrid team-mate Ozil to impact efforts on the pitch.
He said: "Of course I was surprised (he left Madrid), as were a lot of people.
"He is a great player and a good friend of mine, but if you say he is the only (great) player of Arsenal would be disrespectful to the other great players."
He added: "There were three times in my career, the first was when I was 16 and then last summer we spoke, but in the end I signed for Liverpool. That is football."
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