The club's president Ibrahim Kizil told reporters that the 31-year-old footballer had hanged himself in his house in the southeastern Turkish province of Gaziantep.
"Unfortunately, Rajtoral passed away upon a tragic suicide," Kizil said, adding that the club was not aware of any problems.
Rajtoral had played for Viktoria Plzen, Hannover and the Czech international soccer team.
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(Reporting by Ece Toksabay; editing by Alexander Smith)
