Conor McGregor’s long-awaited return to the UFC took place at UFC 329 at T-Mobile Arena in Las Vegas on July 11 and 12, 2026. The 37-year-old Irish fighter faced former UFC featherweight champion Max Holloway in a welterweight rematch, nearly five years after his last competitive appearance. Their first meeting, in 2013, ended with McGregor winning by unanimous decision. The planned rematch lasted about 69 seconds. McGregor injured his right knee during the opening exchange, ending his comeback almost as soon as it began.
The injury followed McGregor’s July 2021 loss to Dustin Poirier at UFC 264, where he broke his leg. Reports on the Holloway bout described damage to the anterior cruciate ligament (ACL) and meniscus in McGregor’s right knee. He underwent surgery in August. UFC CEO Dana White said McGregor would be sidelined for about a year and that the promotion would wait for medical clearance before discussing another fight. The injury turned what was intended as a high-profile test of McGregor’s form into another major interruption to his post-2021 career.
Anti-doping rules also shaped the background to his return. The UFC’s anti-doping program shifted from the United States Anti-Doping Agency (USADA) to Combat Sports Anti-Doping (CSAD) after December 31, 2023. McGregor had left the testing pool after his 2021 injury. Under the former system, returning fighters generally had to spend six months in the pool and provide two clean tests, although the UFC could waive that waiting period in exceptional circumstances. A reported CSAD decision imposed an 18-month suspension over missed collection attempts on June 13, September 19 and September 20, 2024. The suspension ran from September 20, 2024, through March 20, 2026. The reported basis was missed collection attempts, not a positive test.
McGregor’s standing in Ireland and internationally has also changed markedly since his rise to stardom. His achievements included a 13-second knockout of José Aldo in 2015 to claim the UFC featherweight title, followed by a lucrative 2017 boxing match against Floyd Mayweather. In November 2024, a civil jury in Dublin found against McGregor in a case brought by Nikita Hand concerning her allegation of rape in 2018. The civil verdict established liability in that proceeding; it was not a criminal conviction. The case added to the legal and reputational challenges surrounding his public image.
His political statements, described in the original account as echoing hardline immigration policies, and endorsements from figures including Tucker Carlson and Elon Musk have further divided opinion. During a 2025 St Patrick’s Day visit to the White House, McGregor made remarks that Irish Prime Minister Micheál Martin publicly rejected, saying they did not reflect Ireland’s values. McGregor has also made a brief foray into Irish politics, including a short-lived presidential campaign that failed to gain traction, with polls indicating little voter support. He has said he is not seeking to regain public approval.
Despite the controversies and a long spell away from competition, McGregor’s commercial draw remains basic to the UFC’s calculations. The promotion presented the Holloway fight as a major event, expecting its gate to exceed the UFC’s previous record of $21,892,245. CBS broadcast the weigh-ins, while the event’s Paramount+ partnership showed the scale of its commercial reach. As highlighted in a report on the official weigh-in, both fighters made weight ahead of the bout.
McGregor reportedly has one fight remaining on his UFC contract and has discussed a possible return during International Fight Week in 2027, usually held in July. Holloway has been mentioned as a potential opponent, while Justin Gaethje has reportedly offered himself as an alternative. Any comeback depends on McGregor’s recovery and medical clearance. White has said the UFC will not make plans until he is medically ready. No opponent or event details have been established in the supplied reporting.
For Spain, where mixed martial arts has grown in visibility, McGregor’s fights continue to attract attention from fans and sports media. The UFC’s international reach and European broadcast partnerships make major events accessible to audiences beyond Las Vegas. But the abrupt end of McGregor’s 2026 return, alongside his legal and political controversies, has made the story about more than a contest in the octagon. It also measures how long sporting fame and commercial appeal can outlast competitive activity and public trust.
