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reported that Miller, 30, failed a doping test for banned 'muscle growth' substance GW1516, citing three sources with knowledge of the results.

 Jarrell ‘Big Baby’ Miller reportedly tested positive for a banned substance
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Jarrell ‘Big Baby’ Miller reportedly tested positive for a banned substanceCredit: Getty Images - Getty
 Anthony Joshua’s US debut is now in jeopardy after his challenger failed the test
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Anthony Joshua’s US debut is now in jeopardy after his challenger failed the testCredit: Getty Images - Getty

The heavyweights were set to fight on June 1 at New York’s Madison Square Garden, with Brit boxer Joshua defending his WBA, WBO and IBF heavyweight titles.

The test results were reportedly from a random Voluntary Anti-Doping Association-conducted urine test Miller submitted to on March 20.

Miller’s promotional team issued a short statement saying that Miller will continue to train for the fight with Joshua as they will look into the recent failed test.

“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.”

We are working with all relevant parties and will update with more details soon. AJ’s preparation continues for June 1st at Madison Square Garden

Promoter Eddie Hearn

Joshua’s promoter Eddie Hearn responded to the news saying AJ's preparation for the fight also continues as planned. 

“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.”

The drug Miller tested positive for is one of the most popular performance-enhancing drugs, which is used primarily to get rid of fat.

One of the other benefits of GW1516, or Cardarine as it is also called, is that it increases aerobic power and endurance.

It means users can push harder in the gym for longer without getting tired.

Ahead of the fight, the pre-sale tickets broke an MSG record - and it took only two hours to become the highest grossing pre-sale in the history of the arena.

 Jarrell Miller will fight Anthony Joshua on June 1 for the WBA, WBO, IBF and IBO titles
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Jarrell Miller will fight Anthony Joshua on June 1 for the WBA, WBO, IBF and IBO titlesCredit: PA:Press Association
 Miller is seen shoving Joshua as they posed for photos during a news conference in February
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Miller is seen shoving Joshua as they posed for photos during a news conference in FebruaryCredit: AP:Associated Press

Miller, a former kickboxer, is unbeaten in professional boxing, having lost just once in 11 amateur bouts.

He had reached the final of the famous Golden Gloves tournament in 2007, losing to Tor Hamer.

But the American had to go pro in boxing, due to already being in the paid ranks for kickboxing.

Miller has suffered just one draw, coming in his fifth fight against Joey Dawejko - but has since beaten the likes of Tomasz Adamek and Gerald Washington.

In his last win against Bogdan Dinu, he claimed the North American WBA and WBO titles.

Miller is often referred to his nickname, which he created himself during his early pro boxing career.

In the early days, the American would arrive into the ring in a nappy, bib and pacifier - earning him the unusual moniker.

Anthony Joshua flips a table in promo for his June 1 Madison Square Garden fight with Jarrell ‘Big Baby’ Miller
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