KSI'S former boxing trainer Viddal Riley has claimed the YouTuber needs a miracle to beat Tommy Fury.
The pair are set to clash at the Manchester Arena on October 14, with Logan Paul vs Dillon Danis taking place on the undercard.
KSI, 30, has won all three of his previous pro bouts – but he has never come up against a professional.
Fury is also unbeaten in the ring having beaten another YouTuber, Jake Paul, last time out.
He has won nine out of nine, so Riley believes it will take a miracle for his former fight KSI to beat him.
He told T-Bone BXC: "Tommy should win. He's supposed to win. JJ's doing a miracle by winning, and anyone who says anything different is lying.
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"It's a miracle for JJ to win but miracles happen man.
"The one thing that I always say is JJ is hard, he's got actual swingers on him.
"And when you have that, you've got a chance. You always have a chance."
But KSI does not share that view and vowed to "ruin" Fury's life.
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Ahead of the fight, he said: "I've said several things to him and he knows that October 14 he's the b*****d child.
"He's the child that no one really cared about in the Fury family and when I come through and knock him out repeatedly, it's over man.
"Like when I literally ruin your life bro, it's done. And I'll be the man to do it, and I can't wait.
"And I'll do it with a smile."
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