Elon Musk says there’s a reason he hasn’t set a firm date to fight fellow tech billionaire, Mark Zuckerberg: his back.

The 52-year-old SpaceX CEO, who took over Twitter and rebranded it as “X,” previously confirmed that he’d be fighting the 39-year-old Meta billionaire, promising to his followers on Sunday (August 6) that it would be live-streaming on X.

Now, he’s slightly changing his tune.

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“Exact date is still in flux. I’m getting an MRI of my neck & upper back tomorrow,” he clarified later in the same evening.

“May require surgery before the fight can happen. Will know this week,” he added.

Back in June, Elon suggested he was “up for a cage match” with Mark, who is trained in jiujitsu, who then asked Elon to “send me location” for the proposed fight, to which Elon replied “Vegas Octagon,” where mixed martial arts (MMA) championship fights are hosted.

Here’s what Elon was saying hours before his MRI revelation.