Anthony Joshua’s world heavyweight title fight with Jarrell Miller is in doubt after the American tested positive for GW1516 — a banned substance that boosts muscle growth.
Joshua was scheduled to face Miller, who is undefeated in 24 fights at Madison Square Garden for the WBA, IBF, WBO and IBO titles on 1 June.
Both camps have confirmed the incident.
Hearn, representing Joshua tweeted: “We have been informed by Vada that there has been an adverse finding in Jarrell Miller’s sample collected on March 20th, 2019. We are working with all relevant parties and will update with more details soon. AJ’s preparation continues for June 1st at MSG.”
Miller’s camp, Salita Promotions, also tweeted about the result, saying: “We are in the process of obtaining further information about Vada’s finding and will have more to say soon on this developing situation. In the meantime Jarrell continues to train for his June 1 fight against Anthony Joshua.”
Miller is likely to face a hearing before the New York State Athletic Commission to decide whether he will be allowed to fight.
Miller had once failed a drug test too, as a kickboxer in 2014. He tested positive for methylhexaneamine and was banned for nine months by the California SAC.