According to The Telegraph, the use of the aforementioned banned substance could lead to a suspension of up to four years; both the player and Chelsea are awaiting the results of the B test. Meanwhile, the FA confirmed the news to the media outlet.
"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," a spokesperson told The Telegraph.
As recently as December last year, following the test results, Mudryk reacted via social media.
"I can confirm that I have been notified that a sample I provided to the FA contained a banned substance. This came as a complete shock, as I have never intentionally used any banned substance or broken any rules, and I am working closely with my team to investigate how this could have happened.
"I know I've done nothing wrong, and I remain hopeful that I'll be back on the pitch soon. I can't say any more right now due to the confidentiality of the process, but I will as soon as I can," Mudryk wrote on Instagram.
Mudryk hired Morgan Sports Law to work on his case, with Chelsea providing legal support. This firm also represented former Juventus star Paul Pogba in his appeal against a four-year suspension for doping, which the Court of Arbitration for Sport later reduced to 18 months.
Pogba has terminated his contract with Juventus and is looking for a new club, having been strongly linked with Monaco during this summer's market.
Mudryk's last game was against Heidenheim in the Conference League on November 28th. Since then, he was listed as 'injured' until December, when he learnt the result of the test.
Now the FA has decided to formally charge him with using banned substances. The 24-year-old midfielder, who cost around 100 million euros from Shakhtar at the start of 2023, has 73 appearances, 18 goals and eight assists for the Blues.