UFC heavyweight champ Brock Lesnar is gravely ill and in the hospital after collapsing in Canada, according to UFC president Dana White.

"He's in rough shape, he's in really bad shape," White said on Saturday after UFC 105.

"He is not well and he is not getting any better. ... He's very, very sick and he's going to be out for a while. He's got a lot of problems."

Referencing mononucleosis, Lesnar, 32, had to push back a title fight against Shane Carwin scheduled for UFC 106 on Nov. 21 in Las Vegas. The fight was postponed to UFC 108 on January 2, but that has since been postponed as well.

"He's got mono and he's got something else wrong with him. I know what's wrong with him, he just doesn't want me talking about it," White said. "He doesn't have cancer or AIDS or anything like this, (but) he's got some problems, man."

White said that the 6-foot-3, 265-pound Lesnar was currently staying in a hospital and may have to go to the Mayo Clinic or another top facility "to figure out what's wrong with this guy."

"He's not going to be getting well any time soon," he said.

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