KSI made an incredible £1 million bet with his brother Deji on the latest episode of the Sidemen podcast - and Eddie Hearn watched on as the deal was agreed.
Both KSI and Deji started out as popular YouTubers in the early 2010s, but as well as their work as social media influencers, have now branched out into the world of boxing.
KSI has won four out of his six professional fights, although lost to Tommy Fury via unanimous decision in Manchester last month.
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His younger brother Deji, meanwhile, has won both of his professional fights to date.
And on the latest episode of the Sidemen podcast, KSI offered Deji an incredible wager worth £1 million.
KSI challenged his younger brother to get abs - and even gave him a timeframe in which to do so.
You can watch the clip below.
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He said: "I will give you £1 million to have abs by the end of next year."
Both men then shook hands on the wager, right in front of Hearn. And the promoter supremo couldn't help but ask a cheeky question - whether Deji had to get a six-pack or eight-pack as part of the challenge.
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KSI replied: "Six. I have to be able to see it. And like you can post it online, then everyone's like, 'Yes, he has abs.'"
Co-host Behzinga wasn't too happy with the bet though, jokingly shouting: "Don't do this man, cos I'll take the bet as well. Can I have the bet please?
"I have [got abs anyway], but can I have £1 million please? If you're just dishing out £1 million for a couple of abs, f**k me."
Deji certainly has experience of rising to the challenge in boxing, having lost all of his opening three fights.
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He was defeated at amateur level by Jake Paul, before losing exhibitions to Vinnie Hacker and Alex Wassabi.
But Deji has a perfect record in professional boxing, winning both of his fights over Fousey and Swarmz. They were sandwiched by an exhibition defeat to the legendary Floyd Mayweather.
Can Deji rise to his latest challenge and win the £1 million wager? We'll have to wait to find out.
Topics: KSI, Boxing, Eddie Hearn
Ryan Smart