Tyson Fury warned his younger brother Tommy Fury that he must take the challenge posed by Jake Paul seriously.
Fury and Paul are due to fight at the third time of asking after injury and visa problems put paid to the first and second planned dates, respectively.
With February 26 closing in, the pair have a month to put the finishing touches to their preparation before putting their unbeaten records on the line.
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Speaking to Sky Sports, the WBC champion did not dismiss Paul’s talents after solely fighting crossover boxers.
"I think he's a decent boxer. A lot of people think he's just a YouTube person who doesn't know how to box but I've actually seen him training and I've actually seen his fights and I think he's decent," he said.
"He's like a novice professional. He's only had six fights so he's exactly as good as he should be at this stage. He's not an Olympic boxer but then again neither am I."
He offered a note of caution to his brother
"He can't just go to the ice cream parlour and not train. He's got to really focus and have the right sparring and everything," Fury added. "He's got to take it really seriously.
"He's got to do the job when he's in there because it's not just the opponent. If you take the opponent out of the equation," he continued. "There's big pressure, a big stadium, top of the bill and all that sort of stuff.
"The thrills and spills of big-time boxing sometimes get to them so it's going to be interesting to see if Tommy can handle that pressure, which I know he can, but it's going to be interesting to see him do it in front of the world.
"I think Tommy knocks him out inside six rounds. Tommy hits and hurts me and I'm 20 stone and six foot nine and the heavyweight champion of the world."