Oleksandr Usyk has told Jake Paul to 'stop boxing' ahead of his controversial clash with Mike Tyson later this year.
It was confirmed back in March that the two men would be meeting in the ring, despite a huge 30-year age gap between the two fighters.
Paul has won nine of his 10 career fights so far, silencing many of his critics in the process.
His defeat to Tommy Fury last year is the only time the 27-year-old has failed to come out on top from a bout.
Jake Paul has been told to 'stop boxing' by Oleksandr Usyk ahead of the American's battle with Mike Tyson
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But many are still unhappy that Paul, a former YouTuber, is becoming such a big figure in the sport.
Now, Usyk has stuck the knife into the American by urging him to 'stop boxing'.
The Ukrainian, who is preparing for his own fight with Tyson Fury, made the comments while playing a word association game as part of the promotion for that showdown.
However, while Usyk feels Paul should walk away from the sport, there's zero chance of that happening right now.
The boxing star is looking forward to his clash with Tyson, even if many have condemned his decision to fight a man who is 30 years older than himself.
And Paul, speaking earlier this week, has revealed he plans to bulk up substantially on order to boost his chances of coming out on top.
"It's just like shocking to people that that is how much I weigh," he said on his podcast.
"I think just because normally I'm fighting at 200 and walking around at 210. It's weird to me that I'm weighing 230.
"But since this was noodling after my last fight I'm just getting to eat as much as possible and it turns out my body carries this weigh super well.
"And I'm only growing. I think I'll get up to 240 and probably cut down so I'm like way faster.
"But if I'm training for this camp - and camp hasn't started - but if I'm training in this camp at 240 and then I cut down to 220 it's basically like I had a 20lb weight vest on for the whole entire camp.
"So my muscles are going to be so much stronger and that speed will come through."
Paul then added: "Same training camp essentially but there are a few minute differences which I will elaborate on.
"But it's always the same amount of hard work and dedication.
"But the differentiators will be me being able to eat which I've already noticed is so much better for recovery.
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Jake Paul has revealed he plans to bulk up ahead of his boxing fight with Mike Tyson
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"As well as sparring heavyweights and I'll probably spar less because the heavyweights obviously punch harder and it's more intense taking shots from heavyweights, which I will obviously be doing this camp."
Tyson, meanwhile, admitted last month that he was 'scared to death' as he prepares to return to the ring.
The boxing icon last fought Roy Jones Jr in an exhibition last year, with that contest ending in a draw.
And Tyson, speaking to Fox News, revealed he was nervous as he looks to put Paul to the sword.
"I have a weird personality - I don't think it's weird though. Whatever I'm afraid to do, I do it. That's how it is," he said.
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"I was afraid of the Roy [Jones Jr. fight [in 2020].
"I was 100 pounds overweight, I was however old, 54, 53, and I said ‘Let’s do it.' Anything I'm afraid of, I confront it. That's my personality. Right now, I'm scared to death."