FIFA are investigating Bayer Leverkusen star Hakan Calhanoglu over alleged contract irregularities that could see him face a ban from Euro 2016 this summer.

Bayer spokesman Dirk Mesch told SID: “There is an ongoing investigation between the player Hakan Calhanoglu and FIFA, which deals with the time before he joined Bayer Leverkusen. It seems that there have been irregularities in the player’s contract.

“This is an ongoing investigation, where we will have to gain more information before we can talk about it in more detail.”

Calhanoglu joined Bayer on a €14.5 million move from HSV in 2014 and his previous club before that was Karlsruher.

The investigation is reported to be regarding an alleged business transaction he made with Trabzonspor before signing a professional contract with Karlsruher.

Trabzonspor claim to that Calhanoglu and his agent took a payment of €100,000 each from the club when he was 17 to join the Black Sea Storm on a professional contract and that if he pulled out of the deal he would have to pay €1 million.

The Turkish Super League side filed a complaint to FIFA in 2013 that Calhanoglu had broke the terms of their agreement.

German tabloid Bild claim that the Turkish international is on both Manchester United and Barcelona’s shortlist of summer targets.

Calhanoglu may face difficult getting a transfer and making it to the European Championships this summer if FIFA do issue the 22-year-old with a ban.

The Turkish international star has a total of eight goals and eights assists in 34 appearances for Bayer Leverkusen in all competitions this season.

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