The Turkey international has been linked with a variety of clubs this summer, including the likes of Bayern Munich, Chelsea and Arsenal but Bayer Leverkusen have emerged as front runners for his signature.
And the 20-year-old wants to move to the BayArena so he can prove himself at continental level, with B04 having sealed a Champions League spot for next season.
"I told them that I want to go - no matter whether we play in the first or second division," he told Sport Bild.
"I would definitely leave Hamburg. I can see myself clearly at Bayer Leverkusen. The fact is, I want to play in Europe and I want to make my parents happy.
"I want to go as far as Ronaldo and Messi. I want to be a world star."