The plan to reschedule the UFC heavyweight championship bout between champ Brock Lesnar and challenger Shane Carwin at UFC 108 on Jan. 2 has been nixed.

Carwin (11-0) was informed Wednesday evening by the UFC through his manager that the illness that caused Lesnar (4-1) to withdraw last week from their UFC 106 main event on Nov. 21 has persisted, rendering the champ unfit to train for a Jan. 2 fight as well.

"Guys my manager Jason Genet just told me that UFC 108 is not happening," Carwin wrote on his blog. "Brock has mono(nucleosis) and what the UFC has told me is that I have earned the title shot but I have to wait for the title holder."

The two heavyweights had been issued bout agreements for the UFC 108 date happening at the MGM Grand Garden Arena in Las Vegas.

When reached for comment, UFC president Dana White told Yahoo! Sports that mononucleosis will prevent Lesnar from training for at least a month and possibly up to six weeks.

According to WebMD, mononucleosis "is a common viral illness that can leave you feeling tired and weak for weeks or months. Mono goes away on its own, but lots of rest and good self-care can help you feel better."

White said he is still figuring out if Carwin will fight someone else in the meantime or if he'll have the undefeated heavyweight wait until Lesnar is ready.