The winger returned a positive result for an A-sample in late October and now awaits the answer from a decisive B-sample.
Reports in his homeland of Ukraine say meldonium has been found in Mudryk’s system.
The performance-enhancing drug makes the body “use oxygen sparingly and restore energy quickly”.
It has been described as a “metabolic modulator” that “modifies how some hormones accelerate or slow down to different enzymatic reactions in the body”
Meldonium was banned by the World Anti-Doping Agency in 2016.
Tennis legend Sharapova was initially banned for two years after testing positive for it soon after it was added to the prohibited list.
An an appeal saw her suspension reduced to 15 months.
Sharapova revled she had been taking meldonium for ten years due to health issues and did not realise it had become a banned substans
In another high-profile case, Russian boxer Alexander Povetkin also tested positive in 2016 and it led to his bout against Deontay Wilder being called off.
He was later cleared following a second test
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