"The Earth is flat, 100 per cent," Froch said on the podcast.
"There's no proof of the Earth's curvature and this fake space agency 'NASA', use CGI images and every one is different."
"I'm looking at them thinking, 'Hang on a minute, they're like cartoons'," prompting laughter from the hosts.
Perhaps, Froch needs to see it to believe it as he noted how he will believe the Earth is round when Richard Branson begins commercial flights to space with Virgin Galactic.
"When someone like Richard Branson goes up there and starts doing chartered flights like they're talking about doing and you can look back on Earth and see the Earth's curvature, I'll believe the Earth is a globe," he said, declaring he's on the fence until this happens.
Froch is most famous for knocking out George Groves in front of 90,000 people at Wembley back in 2014, and retired after this with a record of 33-2 (24 KO wins).