Chelsea winger Mykhailo Mudryk has been charged by the Football Association with breaching its anti-doping rules after he failed a drugs test.
The Ukraine international, 24, was provisionally suspended by the FA in December after an "adverse finding in a routine urine test".
At the time he said he was in "complete shock" and he "never knowingly used any banned substances".
He has not played for Chelsea since 28 November.
In a new statement on Wednesday, the FA said: "We can confirm that Mykhailo Mudryk has been charged with Anti-Doping Rule Violations alleging the presence and/or use of a prohibited substance, in terms of Regulations 3 and 4 of The FA's Anti-Doping Regulations.
"As this is an ongoing case, we are not in a position to comment further at this time."
Chelsea have not commented.
More to follow.