Chelsea have confirmed that one of their players has been contacted by the English FA following a routine drugs test.
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The Blues have released a statement after an "adverse finding" was picked up in a urine sample provided by Mykhailo Mudryk.
"Chelsea Football Club can confirm the Football Association recently contacted our player Mykhailo Mudryk concerning an adverse finding in a routine urine test," it read.
"Both the Club and Mykhailo fully support The FA's testing programme and all our players, including Mykhailo, are regularly tested.
"Mykhailo has confirmed categorically that he has never knowingly used any banned substances. Both Mykhailo and the Club will now work with the relevant authorities to establish what has caused the adverse finding. The Club will not be commenting any further."
The Ukraine international has not been involved in Chelsea's last three Premier League matchday squads, while he was an unused substitute in the two prior.
Mudryk has struggled since joining the London-based giants in 2023, having only scored 10 goals in 73 appearances.
The 23-year-old has released a statement of his own, meanwhile, insisting he knows he has "not done anything wrong".
"I can confirm that I have been notified that a sample I provided to The FA contained a banned substance," he stated.
"This has come as a complete shock as I have never knowingly used any banned substances or broken any rules, and am working closely with my team to investigate how this could have happened. I know that I have not done anything wrong and remain hopeful that I will be back on the pitch soon.
"I cannot say any more now due to the confidentiality of the process, but I will as soon as I can."
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Mudryk has played just 850 minutes of football this season across all competitions.