Tommy Fury fears Tyron Woodley will beat Jake Paul and ruin his hopes of fighting the YouTube star.
Paul will step up in competition when he fights former UFC welterweight champion Woodley on Sunday in Cleveland in Woodley's first professional boxing fight.
Fury, who is 6-0 inside the ring, has been on a collision course with Paul since the two started trading shots at each other on social media earlier this year.
But Fury believes a fight between the two could be shelved if Woodley upsets the odds.
"I've got nearly four million people following me around the world. Jake's got however many he's got. It's a massive colossal fight everyone knows that and provided we both come through our fights, let's get it on," he said.
"But it's hard to say. There's no way in hell Tyron should lose this fight. Woodley's been fighting his whole life, he knows what it's like to be in a fight. He knows how to handle himself when he's hurt. Woodley should come through this on Sunday."
Fury will make his US debut when he fights Paul's sparring partner Anthony Taylor on the undercard. Taylor, an MMA fighter who has fought for the likes of Bellator and BAMMA, will step into the ring for just the second time.
Despite backing Woodley to beat Paul, Fury is not counting out the social media star, adding: "But Jake's Jake. He's been doing this every single day, a lot longer boxing wise than Woodley.
"The main thing we are looking for on Sunday is how Jake performs when his backs against the ropes, when he's been hit and hurt. I think there's very good chance of that happening on Sunday.
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"I have had fights where I've been knocked up and down. So I know what to do and what I've got inside of me. Let's see if Jake Paul's got the minerals for it.
"If he thinks the real deal, come and face me. I'm no Olympic gold medalist here, I've had six amateur fights when I was a kid. So I'm not great shakes, if he wants to get it on we can get it on."
Elsewhere on the card, which will take place live on Showtime pay-per-view, British heavyweight Daniel Dubois will make his US debut against Joe Cusumano and seven-division champion Amanda Serrano will fight Yamileth Mercado.
