KSI claims Logan Paul does not want his brother Jake to fight him after the "terrifying" experience of their bouts.
The YouTube sensation drew with Logan in their 2018 grudge match before winning a follow-up event a year later by scrappy split-decision.
But the foes turned friends in the years since following the launch of their popular drinks company Prime.
Jake, however, has not forgiven or forgotten his own rivalry with KSI, fuelling demand for a bitter bout.
But KSI believes his older brother Logan is not so keen on the idea.
He said on Viddal Riley's YouTube channel: "I even feel like Logan doesn't want me to fight Jake, because he knows how hard I train.
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"He knows I'm relentless, Logan has fought me and he knows how long it is.
"Even if you have everything on me, there is that little bit inside of me that never gives up.
"Having to fight that and put your all into fighting this guy but he's still coming forward, it's terrifying."
KSI, 30, returns to the ring on October 14 against Tommy Fury, who beat Jake in Saudi Arabia in February.
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Logan, 28, features on the undercard against Conor McGregor's training partner Dillon Danis.
Jake, 26, is set to be ringside for the event after claiming KSI is doing everything he can to avoid their proposed fight.
He told Twitch streamer Adin Ross: "It's gonna happen, it I mean it has to happen. It has to happen, we'll make it happen, for sure.
"I've been trying to do it, man. He then goes online and like lies about it. Certain clauses and stuff.
"What happens in boxing is if they don't really want to do it, they just hide behind all these crazy clauses to make it seem like it's the contract that's holding everything up but really it's the person who doesn't want to do it.
"And it's like look, I've fought everybody, every single time. Anyone who asks to fight me, I did the deal, I made it happen.
"They want ten round? OK, cool. They want this? OK, let's f***ing do it. So I make these fights happen back to back to back to back for past three-and-a-half years.
"And people think that I'm the one that wouldn't make it happen? It's like, come on guys let's be realistic here.
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"And I told them, I'll do it in the UK, you can be the A-side, I don't give a f*** about any of that.
"So it's like, where is the contract hold up? Oh no, you just don't want to do it."
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