UFC star Conor McGregor announced Monday he underwent surgery after suffering ACL and meniscus injuries in his first-round loss to Max Holloway at UFC 329. "With today's regenerative medicine advancements and improved training methods it is well within my realm to return by next summer," he said. McGregor's return to the Octagon lasted just 1:09. He landed awkwardly after attempting a flying kick, and it quickly became clear he had suffered a serious knee injury. "McGregor has to have knee surgery.