Anthony Joshua and Jarrell Miller (right) clashed at a news conference in February

Anthony Joshua’s next opponent Jarrell Miller has returned an “adverse finding” in a drug-testing sample, says Joshua’s promoter Eddie Hearn.

American Miller, 30, is due to fight Briton Joshua, 29, at Madison Square Garden in New York on 1 June.

Joshua is scheduled to defend his IBF, WBA and WBO heavyweight titles against the undefeated Miller, who has never fought for a world title.

Hearn said Joshua’s “preparations continue” for his US debut.

Hearn said he had been informed by the the Voluntary Anti-Doping Association (Vada) about the finding from a sample collected on 20 March. Vada operates within boxing and mixed martial arts.

“We are working with all relevant parties and will update with more details soon,” he said on Twitter