Saturday’s fight between Conor Benn and Chris Eubank Jr in London has been postponed.
Benn, 26, returned what promoters said was a “damaging analytical finding of traces of a fertility drug”.
The British Boxing Board of Control said the fight was “forbidden and not for the sake of boxing”.
Promoter Matchroom confirmed on Thursday that the fight had been postponed.
“After discussions with various parties, we have made the decision to formally postpone the fight between Chris Eubank Jr. and Conor Benn,” said Matchroom.
“It is undeniable that the decision taken by the British Boxing Board of Control to lift the sanction was procedurally flawed and without due process,” he added.
“That remains a legal issue between the developers and the Council that we want to pursue.”
At Wednesday’s media training session, Benn insisted he was a “clean” fighter.
Eubank and Benn would meet in the ring at 157kg, 30 years after their fathers Nigel Benn and Chris Eubank Sr fought.
Matchroom promoter Eddie Hearn sought to overturn the BBBofC’s decision as both fighters’ camps said they wanted the fights to go ahead in an appearance on Wednesday.
Following the decision to postpone the fight, Eubank Jr said on Twitter: “I can’t believe it. I’m truly sorry to the fans and everyone who bought tickets, traveled and booked hotels, this shouldn’t have happened. He’s out of school…for now .”
Earlier on Thursday Hearn ruled out seeking a new fight sanctioning body.
“It’s been done before and it’s not something I’ve looked at before or necessarily agreed with,” Hearn said. “This is not a situation where we want to go wrong and come up with an alternative plan.”
Matchroom’s statement said, “While there are legal ways to facilitate the fight as planned, we do not believe it is in the best interests of the fighters, or the wider interest, to play so late.” Sport.”
He added: “As a developer, we take our duties and obligations very seriously, and a full investigation will now need to be carried out.”
Benn issued an “analytical finding” against fertility clomiphene in August following a trial by the Voluntary Anti-Doping Association (Vada).
Clomifene can be used to increase testosterone levels in men and is banned by the World Anti-Doping Agency (Wada) in and out of competition.
Vada was contracted by Benn and Eubank to carry out additional testing in conjunction with UK Anti-Doping, which is the Council’s official anti-doping partner and affiliated with Wada.
Eubank’s promoter Kalle Sauerland confirmed on Wednesday that both camps had known about the drug test results for several weeks and that Eubank wanted to go ahead with the fight.
“We immediately discussed it with the most important person from our side, the athlete,” said Sauerland. “He happily followed through and spoke to Ben directly.”
Inside Matchroom and broadcaster DAZN, they are convinced that Benn is innocent of intentional doping.
Hearn argued that since the Board does not “recognize” VADA, they had no reason to cancel the fight or suspend Benn.
UK Anti-Doping (UKAD) chief executive Jane Rumble said: “UKAD notes with concern the news of boxer Conor Benn’s failed VADA test.”
Rumble added: “UKAD acts on all doping reports and always encourages anyone with information about suspected doping activity to share it with us.”