The 18-year old striker has joined from Bursapor for an undisclosed fee after impressing in the Turkish Super Lig in recent times.
Unal became the youngest player to score in the Turkish Super Lig at the age of 16 and his impressive performances led to a debut for the Turkey national team against Luxembourg in March.
Unal has made 31 appearances for Bursaspor side since making his debut in 2013.
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