KSI has vowed to disappear in shame and "probably delete everything" if he loses to stand-in opponent Swarmz.
The YouTuber faces rapper Swarmz following three years out because Alex Wassabi pulled out due to concussion.
And cocky KSI claims he'd "f*** off" forever if short-notice replacement Swarmz lands a shock debut win at London's O2 Arena on August 27.
Many fans have derided the match-up after KSI rejected Jake Paul's offer to drop weight and take the fight for free.
And even musician KSI, who beat Jake's brother Logan Paul, has mocked the contest.
The Brit said: "Imagine if I lost to Swarmz, honestly I would probably delete everything.
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"I'm gone. I'll see you later, I would leave the Sidemen. I'd be selling my shares and I'm f****ng off. You'd never see my face again."
KSI, 29, insists he plans to fight JP next year – when he believes he'll be back to his sharpest.
He said: "I haven't fought in three years, this is supposed to be a warm-up fight.
"Nobody is supposed to care who I fight because I'm going to beat them anyway.
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"Like I said before whether it's Alex or it's Swarmz, I'm fighting so I can get rid of the cobwebs and be active again in the boxing scene
"After Swarmz, do you think I'm just going to be fighting nobodies? Of course not, I'm going to be upping the levels.
"There's a long-term goal in all of this, it's not just beating Jake Paul. It's about creating YouTube boxing events that everyone is excited for."
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