Anthony Joshua‘s planned world heavyweight title defence against Jarrell Miller has been thrown into doubt after the American allegedly returned a positive drugs test. 

Big Baby’s urine sample from a random Voluntary Anti-Doping Association test is reported to have tested positive for banned substance GW1516. 

Dillian Whyte has thrown his hat into the ring, while promoter Eddie Hearn begins searching for a contingency option for the June 1 fight at Madison Square Garden. 

“We have been informed by Vada that there has been an adverse finding in Jarrell Miller’s sample collected on March 20th, 2019,” said Hearn. 

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

Miller was kickboxing in 2014 when he tested positive for methylhexaneamine in a urine sample and was suspended for nine months by the California State Athletic Commission.