Tyson Fury has been advised on three things he must do in order to beat Oleksandr Usyk in February's huge undisputed fight.
Dave Allen has previously sparred both fighters and has told the Gypsy King how he should approach the bout.
Fury and Usyk will finally go head-to-head in Riyadh in Saudi Arabia on February 17.
The pair will put years of trash talk behind them and put all their belts on the line to find out who is the real undisputed champ.
Tyson Fury has been advised how he can beat Oleksandr Usyk
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Fury heads into the fight after an unconvincing win over MMA fighter Francis Ngannou last October.
He will need to step up his game in order to topple Usyk, who is unbeaten in his 21 professional fights to date.
Allen knows both fighters and was famously forced to temporarily retire after suffering concussion in a sparring session with Usyk.
He has given an insight on what works against the Ukrainian and what doesn't.
The first instruction Allen has sent to Fury is to frustrate Usyk, rather than attempt to bully him.
Allen told BBTV Boxing: "I spent a lot of the rounds trying to put pressure on [Usyk], bully him – it didn’t work.
"He’s a master at [dealing with that]. People have been doing that for years with him.
"I think you’ve got to frustrate him. Lots of feints, lots of movements, you’ve got to antagonise him.
"He’s not physically the strongest. He’s not the biggest puncher.
"This [his head] is where he wins the fights. And I believe Tyson is the only man capable of beating him at his own game and I think that's how you beat Usyk to be honest.
"All the talk is size and all the rest of it but there is more than one way to skin a cat.
"Size doesn't always mean turning up and bullying him."
Allen also believes that Fury must approach the fight with the same tactics he used in his famous win over Wladimir Klitschko.
Fury beat Klitschko in 2015 to become world heavyweight champion for the first time in his career.
Allen added: "If I was training Tyson Fury, I would go about it with the same tactics he used in the Klitschko fight, from experience of sparring both.
"It's the biggest fight since [Lennox] Lewis v [Mike] Tyson probably and probably bigger than that.
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Tyson Fury edged past Francis Ngannou in his last fight
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"These two men, none of them are in serious decline. I don't think either is at their best anymore but you can argue they're both not far out of their prime.
"They're both on the slide but they're both still unbeaten.
"If I was Tyson I would go about it like the Klitschko fight, it's about results at that level. So I believe that's the way to go about it.
"Lots will disagree with me, but I wouldn’t advise anyone to go marching onto Oleksandr Usyk.
"Tyson’s been down the last couple of fights – you don’t want to walk on to a man with that ability and that speed."
Oleksandr Usyk has not tasted defeat in his professional career
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Allen's final instruction to Fury is to use trickery in order to allow his huge size to play a factor later in the fight.
He concluded: "Start cautiously, lots of trickery, and if Usyk slows down then that size advantage in the aspect of bullying can come into play.
"But they will have their idea of going about it and they're more qualified than me, so it will be interesting how they go about it."
