The reigning middleweight champion was taken to hospital after suffering from pan in his abdomen
Robert Whittaker has withdrawn from his UFC 234 middleweight title defence against Kelvin Gastelum.
The reigning 185lbs champion has been forced to undergo surgery after suffering a hernia in his surgery.
UFC President Dana White confirmed the news to ESPN after rumours began to circulate on social media.
The Australian experienced pain in his abdomen late on Friday night and was taken to a hospital, where he was diagnosed with a hernia. The issue is not believed to be related to his weight cut.
This is not the first time Whittaker has been forced to withdraw from a fight in Australia.
Back in 2018, the 28-year-old was forced to withdraw from his middleweight title defence against Luke Rockhold.
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As a result, Anderson Silva v Israel Adesanya has been promoted from co-main event to headliner at the Rod Laver Arena in Melbourne.
The middleweight bout is still scheduled for three rounds, with the Lightweight clash between Lando Vannata and Marcos Rosa Mariano moved from the Fight Pass Prelims to the pay-per-view.