Currently, the identity of the banned substance remains undisclosed.
Journalists reached out to Mudryk and his manager for a response, but they have yet to provide any comments.
As reported by UA-Football, Mudryk is facing a potential four-year ban.
Mudryk has made 73 appearances for Chelsea, scoring 19 goals. His last match was on November 28 in a Conference League game against Heidenheim, and he stayed on the team’s roster until early December.