Eddie Hearn, promoter of BOXING, has attacked Jarrell Miller as a drug cheat and claimed that the heavyweight "owes" him money.
Miller will fight his first fight in three-and-a half years at a Triller Show next month.
Jarrell Miller will be returning to boxing after nearly four years
Anthony Joshua was to be fought in New York in 2019, according to the 33-year-old.
Miller failed three Voluntary Anti-Doping Association drug tests before the fight, resulting in a huge loss.
A year later, another drug bust led to the ex-kickboxer being placed on suspension. He is currently serving a two-year backdated suspension.
The Nevada State Athletic Commission voted to re-licence Miller on June 17 provided he continues to pass clean tests.
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Hearn admits he likes Miller but believes that the boxer should be banned from the ring.
TalkSPORT was informed by the Matchroom boss that some fighters have made mistakes and others have cheated.
"You must understand that when he failed drug tests for Anthony Joshua, he was injecting drugs into him in order to beat Anthony Joshua. That's outrageous, that's criminal.
"Ultimately, I don’t believe he should be allowed fight again, but I’m not part of the governing bodies, and I’m not part of the commissions."
FREE BETTING AND SIGN-UP DEALS - THE BEST NEW CUSTOMER OFFERINGSJarrell Miller is a good guy. Although I like Jarrell Miller, I believe he is a nice man. However, he has repeatedly cheated in an attempt to gain an unfair advantage against another athlete.
"And he owes money to me, sincerely." He will pay me."
Miller, 33, attributed his failure to fight Joshua, 32, to a tainted Supplement and stem cell shots in the elbow.
In 2020, the heavyweight would sign a contract with Bob Arum's Top Rank stable. However, he was again tested positive for a banned drug.
Miller pleaded guilty to the SEX PILL charge and is currently under a ban. However, Miller has been given a date for his return.