Former Real and Arsenal star Ozil played with Guler at Fenerbahce.
He told Marca: He was like my little brother when we both played for Fenerbahe. Everyone knows his talent, so I don't want to praise him too much and put more pressure on him.
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"His situation is not very easy to manage, especially when all the hopes of a country as fascinating as Turkey rest on him. He must be patient. His time will surely come. He is still very young.
"You can learn a lot in every training session and he has world-class players in front of him. Patience."