John Fury was involved in an angry altercation with Greg Paul at an open training session ahead of his son Tommy Fury's bout with KSI.
John was approached by Greg - the father of Logan and Jake Paul - during the open session on Wednesday and a fight almost broke out between the pair.
Tommy, who is due to fight KSI at the AO Arena in Manchester on Saturday, was conducting media interviews before the altercation took place.
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It was the second tense incident of the day involving John Fury, who was spat at by KSI in a moment that shocked fans. Check it out below.
The altercation with Paul, uploaded to X by Happy Punch, shows the American approaching John Fury in a calm and friendly manner before things turned nasty.
''Hello Greg Paul, do you think you can beat me?," said Fury, who is reportedly eager to return to the ring himself.
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''No, no I don't wanna fight,'' replies Greg, as he tries to de-escalate the situation.
''Do you really. I'll wipe the floor with all of you,'' added Fury.
Logan and Jake's dad attempted to calm the matter but only made Fury angrier, before a team of security stepped in to eventually cool matters.
An outspoken character, Irish-born former professional boxer Fury caused controversy at a press conference in August, flipping a table in frustration.
''There's too much disrespect, but I am the disrespecter and I'll do it proper,'' he later told Boxing Social.
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''I'll fight them all together. People will say what they are going to do from across in America, but when they are up close and personal you can see what they are.
He also cheekily gave a prediction ahead of son's Tommy fight with KSI, adding: ''It's a one horse race mate, he will be lucky to get out of the first round.''
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Topics: Boxing, John Fury, Logan Paul, Jake Paul
Matthew Holt