A former professional boxer has recently left people questioning his sanity after he claimed that there is no proof that the Earth is actually curved, also taking a swipe at NASA while he's at it.

During an episode of the Pound for Pound podcast with Jake Wood and Spencer Oliver, Carl Froch, a former British boxer, said that "there's no proof of the Earth's curvature."

The 45-year-old, who is best known for his incredible knockout blows throughout his 12-year career, slammed NASA as "fake" stating that they have fabricated images of outer space.

"The Earth is flat, one hundred percent," he told Wood and Oliver.

[[imagecaption|| Carl Froch attending the European premiere of Creed held at the Empire Cinema in Leicester Square, London. Credit: Doug Peters / Alamy]]

"There's no proof of the Earth's curvature and this fake space agency Nasa use CGI images and every [single] one is different," Froch continued. "I'm looking at them thinking, 'Hang on a minute, they're like cartoons.'"

The boxing legend also added that he'll believe that the Earth is round when Richard Branson organizes flights into outer space.

"When someone like Richard Branson goes up there and starts doing chartered flights... and you can look back on Earth and see the Earth's curvature, I'll believe the Earth is a globe."

Of course listeners were left shocked at Froch's remarks, with some even saying that maybe he's been hit in the ring one too many times.

"@Carl_Froch You have clearly been hit in the head a few times too often. As there is no other reason a human could possible be THIS stupid. I mean, seriously," tweeted one user.

"OK, so when you look into the night sky, you can see Saturn, the Moon, Sun, Venus and many stars are all round, but the earth is an exception as it's flat? Come on mate," said another.

However, a third said that at least those opinions are less "controversial" than the ones he spews when discussing boxers.

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And it seems as though he's not the only fighter that is flat Earth-er.

UFC fighter Bryce Mitchell also expressed his views about the theory earlier this year, stating that he could prove that the Earth is 2D.

Taking to his Instagram, he said: "It [the Earth] ain't moving around at no 600-something miles-per-hour, spinning at no thousand-miles-an-hour and floating through the universe constantly, okay."

He continued: "This Earth is flat, it's fixed and the stars and stuff rotate around us."

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Weirdly enough, he then started calling for a debate with Joe Rogan.

"The sun rotates around us, and I can prove that, I would love to debate you Joe Rogan because I'm tired of you Joe Rogan making fun of flat Earth-ers!

"If you're so confident, come on and debate me, buddy. I'm tired of this c*** you're posting."

I'd like to see how that one goes...

It might be best to leave the shape of planets to the experts, guys.

Featured Image Credit: Doug Peters / Alamy

Former professional boxer says there's 'no proof' that Earth is round