KSI reckons he could beat Hafþór Júlíus Björnsson – better known as the Mountain – in a boxing match.
The YouTuber has had two fights in his career; one amateur, one professional, and both against Logan Paul. The men drew their white collar bout, but KSI took the win in their professional rematch.
After that, KSI – real name Olajide Olayinka Williams Olatunji – retired from the sport, but has kept his foot in the door after announcing he’s teamed up with Wasserman Promotions to launch a boxing promotion company.
And despite the fact that Björnsson, who recently defeated fellow strongman Eddie Hall, is a whopping nine inches taller and 63.5kg (140lbs) heavier, KSI has said he thinks he could beat him in a boxing match.
When asked if he could beat Björnsson on the Sidemen YouTube channel, he said: “Yes, bro, he’d be slow.
"You have to be fast, in and out, in and out. It's one of those things because he's slow, while he's recharging to strike, you can hit him.”
KSI has also revealed who he’d like to fight next, and his sights are set firmly on Alex Wassabi.
He went on: “I honestly want to f*** up Alex Wassabi.
"Have you seen the videos he is making? He actually thinks he can beat me. He was like ‘you better not get in my weight class or you are done’. He said that I only have weight and that is the difference between me and him.
"I’m like bro I don’t think you understand who you are talking to. I am not some guy who is going to get walked on. When I put my mind to s*** it's a very different energy.”
Meanwhile, Björnsson has laid out the conditions of a potential rematch against Hall.
In a post-fight interview on his YouTube channel, the Icelandic star said: "He wants a rematch and I am definitely willing to do a rematch if he keeps his word.
"So he has to get a tattoo on his body which says me as World's Strongest Man on his body. Then he has to give me $200,000.
"Then I pick a charity which I will announce on my social media, if he keeps his word you know, which I hope he does, then 100 percent we will do it. If he really wants a rematch then he will.
"It was an agreement we made between me and Eddie, I think that giving to charity is a no-brainer he actually wanted to give all his money to charity. I have huge respect for that but I am actually not sure he will get a tattoo.
"I truly doubt that he will so in reality I don't think the rematch will ever happen because I can't see that happening. If he doesn't get a tattoo there will no be rematch and I am not going to hold him down and say 'get a tattoo'."
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