Anderson Silva against Israel Adesanya has been moved up to the main event.
Behind the first UFC paywall of the year is a middldweight title fight between champion, Robert Whittaker, and challenger, Kelvin Gastelum.
Evidently, Whittaker began complaining of pain in his abdomen during the middle of the night and was taken to the hospital.
Other fights on the UFC 234 main card include Rani Yahya vs. Ricky Simon (Bantamweight), Montana De La Rosa vs. Nadia Kassem (Women Flyweight) and Jim Crute vs. Sam Alvey (Light Heavyweight).
Because his next fight against Yael Romero was a non-title bout after Romero missed weight, Whittaker still has yet to officially defend his belt a year into his status as middleweight champ.
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UFC 234 takes place Saturday at Rod Laver Arena in Melbourne, Australia.
It means the highly-anticipated No 1 contender match between Adesanya (15-0) and Brazilian legend Anderson Silva (34-8, 1nc) will now serve as the main event.
Whittaker's withdrawal has thrown a spanner in the works for UFC president Dana White, who was banking on the winners of the main and co-main events to square off later this year.
This is the second time in 12 months that Whittaker has had to withdraw from a title defence on home soil, after injury forced him out of the card at ufc 221 in Perth last February.