Hasim Rahman Jr. has put the blame on Jake Paul for their cancelled fight.
Rahman was to be the first credible professional boxer that the YouTuber and promoter was to fight, stepping in to replace Tommy Fury on August 6.
A weight limit of 200lb had been agreed, and Paul said that the limit was moved to 205lb to accommodate that fact that his scheduled opponent traditionally fights at heavyweight.
Paul then claimed that a request to move the limit to 215lb was made, which would have represented Rahman losing just a single pound in weight.
On Twitter, Rahman replied: "Jake and his 'team' cancelled this fight, not me! The fight isn’t happening on there [sic] accord not MINE!"
In a video released on social media, Paul had earlier said: "Hasim Rahman Jr has pulled out of the fight. This is not a joke, I am devastated, I cannot f—ing believe this; we just found out this news. This is another case of a professional boxer, just like Tommy Fury, being scared to fight me.
"It is as clear as day that these guys have been so unprofessional to work with, looking for any excuse to suck more money out of this event, to coerce us into doing things and I knew from the jump that this guy didn't want to get in the ring with me.
"The biggest pay day of his life times 10 and he's fumbling it. For what? Because he knows he's going to get knocked out by me. The pressure starts to set in and it's exactly what happens with all these guys. I'm sick of it, I'm devastated and I apologise to everyone on the undercard. This is absurd but there's nothing I can do about it; I apologise to the fans and I'll be back at some point."