In a statement on the official website of Shakhtar Donetsk confirmed that a doping test of Darijo Srna, taken during the extra competitive period, had a positive result.
The sample was taken March 22, 2017. What illegal drug was found was not reported.
At the moment, the Croats are not allowed to participate in matches.
But he took the decision to suspend performances for the club and concentrate on protecting his good name.
Darijo Srna said earlier that they never used illegal drugs.