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Mykhailo Mudryk joined Chelsea in 2023 from Shakhtar Donetsk Chelsea winger Mykhailo Mudryk says he is in "complete shock" after testing positive for a banned substance. The club confirmed on Tuesday that they had been contacted by the Football Association after an "adverse finding in a routine urine test" provided by the Ukraine international. Mudryk denies ever knowingly using a banned substance and Chelsea say they will work to establish what caused the failed test. "This has come as a complete shock as I have never knowingly used any banned substances or broken any rules, and am working closely with my team to investigate how this could have happened, " Mudryk wrote on Instagram. "I know that I have not done anything wrong and remain hopeful that I will be back on the pitch soon. " Under FA guidelines, players can be provisionally suspended from football following a positive drugs test. However, when contacted by BBC Sport, the FA refused to confirm whether Mudryk, 23, was now provisionally suspended or when the test took place. Players found to have intentionally taken a banned substance can be banned for up to four years under Fifa guidelines. Mudryk last played for Chelsea on 28 November and has missed the past five matches in all competitions. He was included in the matchday squad for the Blues' win against Aston Villa on 1 December but did not feature. Head coach Enzo Maresca had said publicly that Mudryk's absence was because of illness. Mudryk, who signed from Ukrainian club Shakhtar Donetsk in a deal worth up to £89m in 2023, has scored 10 goals in 73 appearances for Chelsea. The Professional Footballers' Association is expected to contact Mudryk to offer support. 'Nightmare is over' - Pogba doping ban reduced to 18 months Latest Chelsea news, analysis and fan views Get Chelsea news sent straight to your phone Football latest: Wolves agree deal to make Pereira head coach & Mudryk updates Chelsea's Mudryk 'in shock' at failed drugs test Bell & Filer strike with new ball as England strengthen grip on Test Agatha Christie's iconic detective reimagined A murder, a theft and a mystery where nothing is quite what it seems Your first look at The Split: Barcelona Can Hannah open herself up to the possibility of love again? Watch from 29 December on BBC i Player Elis and John's joyful Christmas special Elis and James are back for their traditional Christmas special, with festive treats and some very special guests How Wham! turned one song into a cultural phenomenon. Video How Wham! turned one song into a cultural phenomenon In celebration of its 40th anniversary, discover the story of how 'Last Christmas' was born How misfit Cavendish changed the face of cycling PGA Tour v LIV - why 'The Showdown' is significant How to become a football agent Who are England and Wales' Euro 2025 opponents? Does sacking a manager help you avoid relegation? Everything you need to know about Euro 2025 'Switch flicked' but Rangers still left with regrets Tears, tantrums & testing times - how boxers deal with a first defeat Diallo's derby - how Amad made the difference for Man Utd Usyk v Fury 2 - all you need to know 'The award goes to. .. ' - England Test team's year in gongs Voyce - a wing who took flight with Wasps 'As South Africans we have to be better' - Champions Cup review The best pictures from the 2024 F1 season 'I want Maddy's death to lead to more support for girls playing football' Six countries, two hemispheres - how will 2030 World Cup work? Why Raducanu is giving herself a 'pat on the back' for 2024 Hamilton to Ferrari and what else to look out for in 2025 Who are the World Sport Star of the Year contenders? © 2024 BBC. The BBC is not responsible for the content of external sites. Read about our approach to external linking.