Sonny Bill Williams' manager Khoder Nasser has accused Francois Botha of sour grapes after the South African boxer claimed he was offered $150,000 to throw last Friday's fight.
Nasser strongly denies Botha's allegation he offered him the sum seven days ago in a Brisbane park, ahead of the World Boxing Association title fight which Williams won on points.
Botha claims he received a phone call from Nasser asking him to be picked up but to be alone.
Botha says his mobile phone was confiscated when he was in the car with Nasser before the offer was made while the pair went for a walk.
Botha's allegation follows confusion over the length of the controversial fight and disputed reports of a failed drug test from Botha.
Nasser says Botha must still be in a daze after the fight.