Jake Paul, his former boxing trainer, has backed KSI to defeat him - despite American showing "more skill" inside the ring.
Viddal Riley, a British cruiserweight prospect, defeated YouTube star KSI by winning two of three bouts.
Jake Paul is 5-0 in professional boxing
In 2018, they drew together with Logan, Paul's 27-year-old brother. They won the rematch by scrappy split decision a year later.
However, KSI - realname Olajide Olayinka Wil Olatunji – has not fought since then and will return to fight on August 27.
Paul, a rival boxer, has become the most successful celebrity fighter in the time since.
Riley, who is no longer KSI's coach to concentrate on his fight career, is certain that his friend can beat Logan's brother.
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On the Happy Hour podcast, he said: "Ofcourse, he can beat him, because he's a man like he.
"Jake Paul has demonstrated more skill than JJ. It is an undisputed fact that he has.
"But Jake Paul never fought JJ and I don’t believe he has fought people of the same size, desire, willpower, and size as JJ."
Paul, 25 years old, announced that he will be returning to the ring on August 13th for his sixth professional fight, just weeks after KSI's return.
FREE BETTING AND SIGN-UP DEALS - THE BEST NEW CUSTOMER OFFERINGSAfter Tommy Fury (23), pulled out, he fought Tyron Woodley in December.
Woodley was defeated by him, who had previously defeated Woodley on points in August.
It was KOs that were won over gamer AnEsonGib, an ex-NBA player Nate Robinson (37), and Ben Askren (37), respectively.
Paul won the fight against Woodley, his biggest win, but Riley, 24, insists that Riley is not comparable to KSI (28 years old) as a boxer.
He said, "People don’t realize that just because one man performed well, doesn’t mean you can do the same against another, because someone might have you beat."
"That's why everybody says, "Oh wow, Jake Paul handled Tyron Woodley'.
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"Tyron and JJ are two different people.
"So, we must hope that the fight occurs so we can finally see it and have new questions about it."
