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.
(Reporting by Ece Toksabay; editing by Alexander Smith)
