Mykhailo Mudryk is currently suspended and unable to play for either Chelsea or Ukraine after being charged with a doping offence by the Football Association - but what is going on behind the scenes?
The 24-year-old winger was provisionally suspended in December 2024 after a urine test provided a positive result for a banned substance, and was formally charged in June.
The FA investigation is ongoing and the outcome, its timing, and any potential punishment all remain unclear. There is no defined time frame for doping cases - they last as long as it takes to sift through all the evidence.
Mudryk's legal defence is being managed by Morgan Sports Law, the firm who worked with former Manchester United midfielder Paul Pogba during his doping case while playing for Juventus, as well as boxer Tyson Fury and cyclist Chris Froome during their respective investigations.
BBC Sport has taken an in-depth look at Mudryk's situation, talking to people in both Ukraine and London to find out where he is and what is going on.