Brock Lesnar, the Ultimate Fighting Championship’s massive heavyweight titleholder, was forced to withdraw Monday from his highly anticipated Nov. 21 title defense in Las Vegas against Shane Carwin.

Carwin, via his Twitter feed, said the fight will be rescheduled for UFC 108 on Jan. 2.

UFC president Dana White confirmed the news to Yahoo! Sports. White said Lesnar has been ill for more than three-and-a-half weeks and unable to train. With the bout at UFC 106 less than a month away, Lesnar was forced to postpone the title defense.

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More UFC Videos Other Popular Sports StoriesNew job for disgraced MLB slugger NFL QB spotted eating hot dog on sidelines More From Kevin Iole'Shogun' has no one to blame but himself Oct 25, 2009 Machida retains title in controversial decision Oct 25, 2009 “He said he’s never been this sick in his life,” White said. “He said it’s been going on for a long time and he just hasn’t been able to shake it.”

White said he does not know if Lesnar had the H1N1 virus, commonly known as swine flu.

The fight matches two of the biggest and most powerful heavyweights in the UFC. Lesnar (4-1), a former World Wrestling Entertainment star, was a junior college and NCAA Division I wrestling champion. Carwin is a former Division II national wrestling champion.

Both men weigh around 295 pounds and cut weight to make the heavyweight division’s 265-pound limit.

Carwin (11-0), who made several appearances in Los Angeles on Saturday to promote the fight, was clearly disappointed at getting the news.

“My heart just sank, as you can imagine,” Carwin told Yahoo! Sports upon hearing the news about the fight postponement.

The UFC announced Monday afternoon it will move the previously scheduled Tito Ortiz vs. Forrest Griffin fight, a rematch of an epic 2006 contest won by Ortiz on a controversial split decision, into the Nov. 21 main event slot

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