3. Age
At the age of 21 Çalhanoğlu has already scored 18 goals and provided 14 assists for Bayer and has established himself as a first-team regular in the Turkish national side.
The Turkish international has consistently developed over the past few seasons. Çalhanoğlu was worth €700,000 at HSV before seeing his value increase to €3 million and then €22.45 (transfermarkt.com) million in just two years.
