Vitali Klitschko has warned Tyson Fury not to abuse his body ahead of his blockbuster bout with Oleksandr Usyk.
The two men will lock horns on May 18, having originally been pencilled in to fight last month.
Their showdown was delayed, however, after Fury sustained a serious cut above his eye while sparring.
Fury has been taking his fight with Usyk extremely seriously, with the 35-year-old often taking to social media to show off his impressive physique.
Boxing: Tyson Fury has been warned not to abuse his body by Vitali Klitschko ahead of Oleksandr Usyk fight
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The Briton is eager to prove a point having struggled during his narrow win over Francis Ngannou in October.
And Klitschko has now fired a warning to Fury, insisting the Gypsy King must stay clear of the junk food and alcohol to ensure he prepares properly for their bout.
“Not so much junk food, no alcohol and good preparations for this fight," he told filmmaker Andrew Drury.
He added: "Everybody expect very dramatic interesting fight, but nobody in the world can predict the decision of this fight.
"It’s heavyweight division, every punch can make a decision.
“And that’s why it will be biggest mistake to say who will be the winner.
"Yes, of course I keep my fingers crossed for Usyk. I hope Usyk will be winner in this fight and bring WBC belt back to Ukraine. But let’s see."
Fury has previously struggled with his weight.
He ballooned while taking a break from boxing a few years ago.
But Fury has since shown the mentality of a champion by bouncing back, rebuilding his career and establishing himself as one of the best heavyweights of his generation.
Fury's father, John, recently spoke about his son's physical transformation.
And the 59-year-old admitted he was pleased with the work Fury has been doing and his mega fight with Usyk creeps closer.
"He looks well, doesn't he?" he told Free Bets.
"I was very sick about the cut because when I saw the shape he was in, he must have dedicated himself and that pleases me immensely.
"I've always said 70 per cent of Tyson is too much for Usyk, but we look like we're getting more than 70 per cent there.
"He looks the best shape he's been in, since he won the title.
"I was impressed, they've done the work, so good luck to them, he looked in good shape for the time he had to as well, which was short notice. Incredible."
John also hit back at suggestions from Usyk's manager, Egis Klimas, that Fury's wife Paris had been responsible for his eye injury.
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Boxing: Tyson Fury and Oleksandr Usyk will lock horns on May 18 in Saudi Arabia
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"I'm surprised that men of their experience at the top level, being around top fighters can even talk like that," he raged.
"It's absolute rubbish, it's silly and they are just making themselves look stupid.
"They're embarrassing themselves with those kinds of accusations. They're worried, they've always been worried. When they've seen the shape Tyson's in, they've thought, 'hang on, we've dropped a clanger here'. They thought they'd see a Tyson who hasn't trained.
"But you know what, that's where you can get caught out, thinking you know too much.
"Usyk said he can't fight in April because it interferes with his training schedule. What does that mean?
"His team make themselves look stupid. They were frightened, they were afraid, they knew their man was going to get smashed to bits.
Tyson Fury has a point to prove ahead of Oleksandr Usyk fight having struggled against Francis Ngannou
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"I saw the shape Tyson was in. He was in for it, Usyk.
"All those people cheering Usyk on, thinking he's going to do the job, let me tell you, he can't do the job. Tyson's tunnel visioned and as Fury's we thrive off the hate.
"All those who think that a little blown-up middle weight is doing the business, forget about it.
"I'll be lucky to see Usyk be fighting in May. Tyson will be ready. Can Usyk be ready? Saying Tyson's wife hit him with a frying pan... what an idiot.
"Accusations and bulls**t, the sparring partner has said what's happened, why don't they just let them get on with it.
"Accidents happen. Talking rubbish is not going to change anything, so shut it, keep it buttoned, and let them fight on the 18th of May. Then it'll be decided."
