Joshua, the 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 the use of a prohibited substance.

Miller has denied taking a banned substance.

“I have NEVER knowingly taken any banned substance and when I found out the news last night I was totally shocked,” Miller said on Instagram.

ESPN reported that Miller had tested positive for the banned substance GW1516, which boosts endurance and helps athletes burn fat, citing three sources familiar with the matter.

ESPN reported on Friday that Miller had also failed a second test for another substance.
Reuters could not confirm either test and the Voluntary Anti-Doping Association, which reportedly administered the second test, could not be reached for immediate comment.

“Remember don’t believe everything you hear and see. The facts will prevail and I shall be vindicated,” Miller said.

“I don’t have anything to hide and the truth will make itself known.”