Ünal has been linked with a number of Premier League and Bundesliga clubs over the past season.
The Turkish international striker was also previously been linked with a €10 million move to Chelsea by the Metro.
The 18-year-old striker has an extraordinary international record, hitting the back of the net 24 times in 25 games for the U16's and has already been called-up to the U19 as well as the U21 sides.
Ünal made his first appearance for the senior Turkish national team in the 2-1 win over Luxembourg on Tuesday 31 March aged just 17.
The Bursaspor striker also became the youngest player ever to score in the Süper Lig in 2013 and already has seven first team goals for the Green Crocodiles.
Ünal scored one goal in 197 minutes of first team football last season and also provided two assists in the Europa League qualification stages.
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