Carl Froch has torn into Tyson Fury ahead of the Gypsy King's blockbuster bout with Oleksandr Usyk next month.
The Briton is currently preparing for that fight, with millions from all over the world poised to tune in.
Fury has beaten the likes of Wladimir Klitschko and Deontay Wilder over the years, establishing himself as one of the best heavyweights in the process.
Yet Froch isn't convinced and has questioned the credentials of the 35-year-old as the biggest night of his career approaches.
Boxing: Carl Froch has taken aim at Tyson Fury and questioned the credentials of the Gypsy King
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"I don’t know if it was flattering for AJ or if it just looked bad for Tyson Fury, because he struggled against Otto Wallin," he told LuckyBlock.com, discussing Anthony Joshau's victory over Otto Wallin back in December.
"It leaves a lot of question marks.
"How good is Tyson Fury? What’s he ever done? Who’s he actually beaten?
"He obviously beat Klitschko in a bit of a stinker. That was just an awkward, horrible performance where he just got inside Klitschko’s head and messed him up with that jab.
“After the Klitschko fight, Fury had those three big standout fights with Deontay Wilder.
"But how good is Deontay Wilder now? He looked awful against Joseph Parker.
"So now you start questioning him. Is Tyson Fury actually what we thought he was or has he been flattered by the lack of opposition?
"We don’t know but we’ll find out when he fights Usyk.”
Fury certainly has a point to prove when he locks horns with Usyk.
The boxing star was poor during his victory over Francis Ngannou at the end of October, with many fans appalled by his display that night.
Fury won the fight via split decision, despite being knocked to the canvas in the third round.
And Froch was scathing when quizzed on the Briton a couple of months ago, saying his performance was proof he's past his best.
“Based on what I’m seeing and what I’m hearing, Tyson Fury’s past his best, he’s on the slide," he said.
"He’s big anyway, but he’s got this big weight round his waist and he struggles to lose it now.
"He’s in his mid-30s. Financially free. Listening to him and watching him on that Netflix documentary, he’s mentally troubled.”
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Boxing: Carl Froch has cast doubt over whether Tyson Fury is good enough to beat Oleksandr Usyk
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Fury, meanwhile, recently sat down with Usyk and mocked his upcoming opponent for wearing an earring.
“I know he can’t beat me, I know he can’t,” he said confidently.
“A man who wears an earring can never beat Tyson Fury, ever.
“Not a chance, no-one who wears earrings can beat him.”
However, Usyk has now explained why he wears them - saying it's due to a group of Ukrainian warriors, Cossacks.
Boxing news: Tyson Fury and Oleksandr Usyk are preparing for their crunch clash on February 17
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“I can explain about the earrings,” he said, “It’s Ukrainian warrior, Cossack.
“They were the people who defended my country from our enemies for many years.
“This is just the proof of my Cossack lineage – they never lost to anybody.
“There is no beauty or fashion in this.”