Oleksandr Usyk has responded after a photo of Tyson Fury's physique was posted on social media ahead of their undisputed heavyweight title fight.
Fury, 35, will take on Usyk, 37, in Saudi Arabia on May 18 with every major belt in the heavyweight division on the line.
Not since Lennox Lewis in 2000 has a heavyweight held all major titles.
Fury currently holds the WBC belt while Usyk carries the WBA, WBO and IBF straps.
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Their undisputed title fight was originally due to take place on February 17 but Fury was forced to withdraw from the bout after sustaining a cut above his eye during sparring.
It is finally set to go ahead later this month and both fighters appear to be in top condition for the bout.
Ahead of facing the undefeated Ukrainian, self-proclaimed 'Gypsy King' Fury showed off his remarkable physique in a new post on social media.
He shared a topless picture of himself to Instagram, alongside the caption: "Undisputed incoming."
Boxing fans were quick to respond to Fury's post.
"He looks great. Usyk is in trouble," wrote one fan on X.
Another added: "We could be about to see the very best of Fury."
Usyk has now issued his own response to the British fighter.
Taking to Instagram, he posted a picture of himself, also topless, after a training session in the ring.
In an apparent message to Fury, he wrote: "The hard work is done," followed by the tick emoji.
Usyk's promoter, Alexander Krassyuk, has previously expressed doubts over whether Fury would be ready for the rearranged fight after pulling out of the first date.
"Tyson Fury has withdrawn four times already from this fight," Krassyuk said last month.
"Remember that we were looking to fight last April; he pulled out of it then, too. That’s why we fought Daniel Dubois. This will be the fourth camp we have had for Tyson Fury.
"I've not got too much confidence in the rematch happening, by the way. If Tyson Fury loses, will he have the confidence to step inside the ring again?
“Theoretically he can, but we all know what happened in the rematch with Wladimir Klitschko."
Topics: Boxing, Tyson Fury, Oleksandr Usyk, Heavyweight Boxing, Fan Reactions
Rory O'Callaghan