Eddie Hearn has revealed he was sent plenty of messages directly after Francis Ngannou knocked down Tyson Fury back in October.
The two men fought in Saudi Arabia, with Fury winning the bout via split decision.
However, the 35-year-old was knocked to the canvas in round three - with the boxing world left stunned as a result.
Hearn represents Anthony Joshua, who will lock horns with Ngannou on March 8.
Boxing news: Eddie Hearn has opened up on messages he received after Francis Ngannou knocked down Tyson Fury
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And the boxing promoter, speaking to TNT Sports, has now opened up on the moment that shocked the world.
"I couldn't believe it," he said.
"I was in Mexico and everyone was messaging me saying: 'Are you watching this? He's just dropped him.'
"I got it so wrong. I thought it was a mismatch and the fight was a farce and I was so wrong.
"Tyson might have been a little below par but Ngannou comes in as a debutant and I know he's a stand-up fighter in MMA but it's not professional boxing.
"It was unbelievable. I just didn't believe in any sporting arena that a novice in that field could go in and even compete with the top of the top.
"Imagine any other sport where someone could just go on with a little bit of similar experience and I thought he was unbelievable.
"The dangerous thing about Francis Ngannou is that he really believes.
"He believed that he could beat Fury then, imagine what he's believing now.
"Now we've got tape of Francis Ngannou, only 10 rounds.
"It must be difficult going in fighting a guy that you've never seen box before."
Frank Warren also discussed the incident.
Warren says Fury did train for the fight with Ngannou, despite suggestions he underestimated his opponent.
And the 71-year-old would love to see Joshua beat the former UFC star and continue his stunning resurgence.
"Tyson wasn't at his best that night, he trained hard for it but he wasn't at his best," he said.
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Boxing news: Eddie Hearn has been impressed by Francis Ngannou and his stunning rise
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"AJ has everything to lose in this fight.
"He's come off a really good win, looked good, done the business in style and he'll be the favourite on the night.
"Having said that, you know the fella can whack, he can punch.
"It's going to be interesting to see how it develops. I want AJ to win."
With Ngannou and Joshua fighting in March, Fury is currently focused on his upcoming battle with Oleksandr Usyk.
Boxing news: Tyson Fury is preparing for his upcoming bout with Oleksandr Usyk
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The two men had originally been due to fight on December 23.
However, that fight was pushed back to February 17 with Fury needing more time to recover from his victory over Ngannou.
