A new opponent for Anthony Joshua's June 1 heavyweight fight in New York will be announced next week.
Joshua, Britain's WBA, IBF, WBO and IBO world champion, had been scheduled to fight American Jarrell Miller but the New York State Athletic Commission refused to sanction the fight, saying that Miller had committed a violation relating to use of a prohibited substance.
Miller has denied taking a banned substance.
ESPN reported that Miller had also failed a second test for another substance.
Joshua's promoter Eddie Hearn says that Jarrell Miller has returned a second "adverse finding" from a drugs test and will now be replaced as Anthony Joshua's next opponent.
The fight, due to take place in New York, will be Joshua's US debut.