According to a report by Combate out of Brazil, recently-retired former UFC champion Vitor Belfort suffered a serious knee injury early in his training camp.

More from Fightline

Despite doctors advising Belfort to pull out of the bout at UFC 224 vs. Lyoto Machida, “The Phenom” made the walk to the Octagon this past weekend in Rio de Janeiro, Brazil.

Belfort suffered a second round knockout loss to Machida and announced plans to retire following the loss. He left his gloves inside the Octagon and thanked his family, friends and fans for their support over the years.

“Congratulations to Machida team, he surprised me pretty well,” Belfort said. “I want to thank my team, my family and my fans.

“Live is about beginning, middle and end. I think I came to the end. Congratulations to Machida and I’m leaving my gloves here.”

Belfort scored a UFC record 12 knockouts and 13 first round finishes during his career, including capturing the UFC light heavyweight title. He also won the UFC 12 Heavyweight Tournament and was a middleweight title challenger.