Tyson Fury's father, John, was left with blood dripping from his head after clashing with Oleksandr Usyk's camp on Monday.
Both Fury and Usyk are currently in Saudi Arabia ahead of Saturday night's fight, which will take place in Riyadh.
And ugly scenes have marred the build-up to the fight.
In a video from IFL TV, John seems to make contact with a headbutt on a member of Usyk's team.
Another angle from Nikolay Tkachenko's Instagram shows the Briton squaring up to a man wearing a flat cap, with the pair then pulled apart.
Chants of 'we ain't going nowhere, we don't go nowhere' were heard from John.
And Fury's brother, Shane, was livid as well. He could be heard shouting: "Is that not f*****g daft? Stupid b*****d, show some respect.
"Is that not stupid getting in someone's face you f*****g p****."
John was also heard having a go at Alex Krassyuk, Usyk's promoter.
"We can't be beaten, anywhere we go. We are spartans, let's f*****g go," he said.
"Yous will get it, I live for this s**t. Blood, guts and horror. I live for this s**t."
The pre-match fight between John and members of Usyk's team will only add to the intrigue surrounding the bout on Saturday.
It will be the biggest boxing fight in a quarter of a century, with the mantle of being undisputed heavyweight champion of the world on the line.
Not since 1999 has somebody held that title.
And Fury is confident he'll come out on top, with the 35-year-old also insisting he's only in the sport for the money.
He told The Telegraph: “Look, this is an important fight but again, I hate to say it because the boxing fans and the boxing purists and all them w*****s, they don’t want to hear it, but why do you think I box? For the money.
"If anybody in this building, or anybody in professional boxing, tells me they don’t do this game for money, they’re lying to you, and I speak from the heart.
"I do it for the dough. The bigger the deal, the better.
"I’m a prize-fighting pugilist specialist. That’s what I do. I fight for the prize, whether it be gold bars, gold coins, cash, transfers, cars, whatever you want to pay me, pay me in bags of sand for all I care, as long as I can make a drink on it, deal done.”
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Usyk, meanwhile, has revealed he could drop down to cruiserweight if he's able to beat Fury.
“When I think about Muhammad Ali, it’s not just boxing,” Usyk said.
“It’s the path he took, his nature. He fought for his rights, his nearest and dearest.
"This is an incredible feeling, having the opportunity to be here now and do what God allows me to do.
“All the historic champions; all these boxers have done a lot for boxing.
"Rocky Marciano was never defeated, he died undefeated. Maybe I will go back to cruiserweight and win."
Fury has won 34 of his 35 career fights so far, with Usyk unbeaten from all 21 of his own bouts.
