ANGRY John Fury claims Jake Paul refused to submit to drug testing in the wake of his fight with Tommy.
The YouTuber-turned-boxer is due to face the youngest Fury brother next month in a blockbuster eight-rounder at Tampa Bay's Amalie Arena in Florida.
Tommy Fury has won seven of his pro fights
According to reports, the fight contract was filled with bizarre clauses. One of these clauses is that the Brit must change his name from 'Tommy Fumbles' in case he loses.
Dad John suggested something sinister when he said Paul refused to sign up for the Voluntary Anti-Doping Association, (Vada), despite Tommy being willing to do so.
On Instagram, he stated that he had signed a contract with Jake Paul. It contained everything except the kitchen sink. He refused to sign up for the drug-testing Vada.
"To me that's very naughty, because we're meant for a high-profile fight.
"We're doing it, we've always done it. Tommy has nothing to hide. You can test Fury every day and 10 times on Sunday.
"Can you say the same thing about Jake Paul?" "I don't know. People will have to make their own decisions.
"It's illegal to use steroids. If he's using them to gain an edge, then I feel sorry.
"We don't bother anyway - the talent and power of Tommy are going to maw straight through him, regardless of whether he's using it or not.
"But why does it? It is supposed to be a fair fight between two young guys, it's level playing. You're boxing on your territory, on your show. We have all the cards.
John was criticized for comments made in the lead-up to December 18th's event. BT Sport had to apologise to John for his X-rated outbursts during a pre-fight press conference.
The 57 year-old pulled winces from his brothers as he claimed Tommy would knock Paul out, then take Julia Rose to his house and 'do her' like a dog.
The furore that followed did not cool Fury's temper. He demanded that The Problem Child behave like a man, and consent to voluntary testing.
He said, "We are not refusing it, we will sign up today and every day.
"Jake, get up! If you believe you can be the man you claim to be, sign the Vada. Let's get started. Let's get to a level playing field.