That’s according to legendary boxing trainer Freddie Roach.
Anthony Joshua’s fight with Miller has been cancelled after the New York State Athletic commission denied Miller his license to fight because of a failed drugs test.
ESPN first broke the news late last night that Miller had the banned substance GW1516 in his system.
Dan Rafael, of ESPN, posted: “Heavyweight contender Jarrell “Big Baby” Miller has tested positive for the banned substance GW1516 ahead his scheduled challenge of unified world titleholder Anthony Joshua, three sources with knowledge of the results told ESPN on Tuesday night.
“The fight is due to take place on June 1 at New York’s Madison Square Garden and serve as Joshua’s American debut.
“The results, which came to light on Tuesday, were from a random Voluntary Anti-Doping Association-conducted urine test Miller submitted to on March 20.”
And on Wednesday, promoter Eddie Hearn confirmed that Miller had his license taken away by the NYASC.
“(Miller’s) licence has been denied – he can re-apply on any new developments – but yes we’re likely to need new opposition,” he said.
Roach, who was in the corner of Tyson Fury for his draw with Deontay Wilder in December, believes Miller deserves a life ban.
“I was looking forward to Joshua coming over,” he told Express Sport.
“He’s come to Los Angeles a couple of times, he’s a friend of ours.
“I think he is the best heavyweight in the world today. Hopefully they can find a replacement soon.
“These guys who test positive for drugs need to be banned for life, it’s attempted murder in a combat sport.
“There’s no way to get around it, there’s not big enough fines or anything so everyone is doing drugs.
“You just get a slap on the wrist, it’s unbelievable.”
Roach went on to note that a fight between Joshua and Tyson Fury would be incredibly hard to call.
“I won’t say that Joshua beats Fury yet because Tyson is taken lightly for some reason,” he added.
“You can’t take him likely and I’m also friends with Fury, we will see what happens.”