Conor McGregor makes 3-word promise for UFC career in video after another devastating injury

UFC CEO Dana White, President Donald Trump and others recap the planning behind the historic mixed martial arts event on the White House lawn in the new Fox Nation documentary, ‘UFC Fight House: The Making of the Biggest Fight in History.’

After five years out of the Octagon, Conor McGregor's return barely lasted one minute.

McGregor opened his Saturday fight against Max Holloway aggressively, attempting a running kick before throwing a head kick moments later. However, he slipped both times because it was apparent he had suffered a knee injury.

He tried to power through it, but nearly two minutes into the fight, he grabbed at his right leg again, and referee Mike Beltran called the fight after just 69 seconds.

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Conor McGregor reacts after losing to Max Holloway in a welterweight fight at UFC 329 on Saturday, July 11, 2026, in Las Vegas. (John Locher/AP)

In his first post on Instagram since the bout, McGregor vowed to return from the injury.

"We'll be back," McGregor said after showing off his new energy drink.

Prior to that, McGregor showed off the "Mac" drink, enjoying it alongside his wife. McGregor then shared his faith.

Conor McGregor of Ireland reacts after an injury stoppage in a welterweight fight during UFC 329 at T-Mobile Arena in Las Vegas, Nev., on July 11, 2026. (Chris Unger/Zuffa LLC)

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"In the name of the Father, the Son, and the Holy Spirit. Amen. We'll be back. Let's go."

McGregor made an emotional post the day after the fight, saying his "head gasket is gone."

"Destroyed. I had no injury / injuries going into the fight. I was throwing kicks, planted and jumping, all throughout