Basketball legend Shaquille O'Neal appears to have joined the ranks of celebrities who sincerely believe the world is flat.

On a recent episode of The Big Podcast with Shaq, co-host John Kincade asked the star about recent comments from Kyrie Irving, a Cleveland Cavaliers player who recently became the subject of controversy in the US by outing himself as a flat-Earther.

O'Neal appears to whole-heartedly agree with Kincade, saying: "It’s true. The Earth is flat."

"So, listen, I drive from coast to coast, and this s*** is flat to me," he continues. "I drive from Florida to California all the time, and it’s flat to me.

"I do not go up and down at a 360-degree angle, and all that stuff about gravity, have you looked outside Atlanta lately and seen all these buildings? You mean to tell me that China is under us? China is under us? It’s not. The world is flat."

It's just possible O'Neal was joking with his remarks, but numerous listeners believe he was being sincere.