UFC president Dana White made an announcement on Thursday that shocked the MMA world.

White informed members of the media on a special conference call that UFC 151: Jones vs. Henderson has been cancelled due to an injury by Dan Henderson.

“Dan Henderson has a partial tear in his MCL and couldn’t continue,” White said. “He tried to train, tried to continue to work, but there was nothing we could do to save that fight.”

Jones will now face Lyoto Machida on September 22 in the event formerly called UFC 152. That card, which takes place in Toronto, will now be called UFC 151.

White said that one fighter offered to take the bout with Jones and that was Chael Sonnen. However, Jones declined taking the Sonnen bout on eight days notice.

“Chael Sonnen accepted the fight,” White said. “Not only did he take the fight, he said I’d fly to Las Vegas (Wednesday night) and fight him. Jon Jones said I’m not fighting Chael Sonnen with eight days notice. Something like this has never happened in UFC history.”

White said that this is “the first time in 11 years we’ve had to cancel an event. We lose a (expletive) load of money; it’s a big, big deal.”