Oleksandr Usyk has claimed that Tyson Fury was not taking their heavyweight unification showdown seriously enough after postponing the fight due to an injury in training - while the Ukrainian missed the birth of his daughter during his fight camp.
Usyk insinuated that the cut above Fury's eye, which he suffered in sparring, was a result of carelessness on the British boxer's part.
"I sacrificed all the days that we used to spend with my family; New Year, Christmas, my birthday, the birthday of my son, the birthday of my second son, and of course the birth of my daughter," he told a press conference from his training base in Spain.
Usyk said he would now spend two or three days at home, to spend time with his daughter and family, before returning to training.
"I'm not judging anyone, but the thing is that we have to treat this more seriously," he said. "This is a very important and well anticipated fight for the whole world.
"There are certain measures taken by highly professional fighters, normally you use the head gear, using the big gloves, like 20 ounce gloves, for sparring.
"You apply Vaseline on the gloves of the sparring partners, you apply Vaseline on your mask, on your eyebrows, to avoid cuts, to avoid any kind of injuries.
"Because you are treating this in a different manner than a professional you are jeopardising the whole event and you behave disrespectfully to people who are involved."
Croatian heavyweight Agron Smakici has attempted to explain the incident which led to Fury's injury and the fight being delayed.
He told iFL TV: "I'm telling you, it was a punch. I threw a punch, I know I feel the punch.
"But he was pulling my head forward and maybe it goes to the elbow. I didn't do it on purpose."
Additional reporting by Reuters.