Mark Zuckerberg undergoes surgery to replace ACL torn during MMA fight training

“Grateful for the doctors and team taking care of me,” he posted, next to a picture of himself with his left leg suspended in a medical device.

Zuckerberg suffered the injury while sparring, part of his training for a competitive MMA fight early next year, he wrote, adding, “now that’s delayed a bit.”

“Still looking forward to doing it after I recover,” he added. “Thanks to everyone for their love and support.”

Zuckerberg has been practicing martial arts since 2020, Fortune previously reported, and won gold and silver medals at his first Brazilian jujitsu competition in May.

An eventual Zuckerberg-Musk match?

No word yet on whether a much-anticipated fight between 39-year-old Zuckerberg and Tesla CEO Elon Musk, 52, will ever come to fruition—and if so, when. In August, Musk, posting to his platform X (formerly Twitter), said he was physically preparing for the event, which he labeled a “civilized form of war.”

“Am lifting weights throughout the day, preparing for the fight,” he posted, as Fortune previously reported. “Don’t have time to work out, so I just bring them to work.”

Am lifting weights throughout the day, preparing for the fight.

Don’t have time to work out, so I just bring them to work.

— Elon Musk (@elonmusk) August 6, 2023

He said he was getting an MRI of his neck and upper back and “may require surgery before the fight can happen.”

In August, Zuckerberg was posted to Instagram a WhatsApp conversation with his wife, Dr. Priscilla Chan, revealing that he had installed a fighting cage in their backyard to aid in his fitness transformation, Fortune previously reported. The tech mogul took up Brazilian jujitsu during the pandemic and participated in the Murph Challenge on Memorial Day of this year, named after a Navy SEAL who was killed in action in Afghanistan. Workouts for the challenge entailed wearing a 20-pound weighted vest and completing 100 pull-ups, 200 push-ups, 300 squats, and a mile-long run.