Chelsea have been notified by the Football Association of an “adverse finding” in a urine sample provided by Ukrainian forward Mykhailo Mudryk.
The west London club issued a statement on Tuesday morning confirming the governing body had contacted them regarding the finding.
“Chelsea Football Club can confirm that the Football Association recently contacted our player Mykhailo Mudryk concerning an adverse finding in a routine urine test,” a club statement 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.”