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

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.

CLICK HERE FOR MORE SPORTS COVERAGE ON FOXNEWS.COM

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.

WWE'S PAUL HEYMAN TAKES SWIPE AT CONOR MCGREGOR INJURY ON 'MONDAY NIGHT RAW'

"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 camp as well as backstage before the fight. This came out of nowhere. I am beyond dark here. I can only describe it as hell," he said on X.

UFC president Dana White said he assumed McGregor suffered a "blown ACL."

McGregor was participating in his first bout since July 2021 when he lost to Dustin Poirier due to a devastating leg injury. He’s only won one fight since 2020.

Fox News' Ryan Gaydos, Chantz Martin, and The Associated Press contributed to this report.

Follow Fox News Digital’s sports coverage on X, and subscribe to the Fox News Sports Huddle newsletter.