McGregor diagnosed with a serious knee injury: torn ACL, surgery postpones all comeback plans
Conor McGregor faces another lengthy absence from the Octagon after it was confirmed that he tore the anterior cruciate ligament in his right knee during his comeback fight against Max Holloway. The information was revealed by the organization's senior officials Dana White and Hunter Campbell after the UFC Oklahoma City event on July 18, one week after McGregor's appearance at UFC 329 ended after only 69 seconds. Campbell also stated that there was another tear in the knee, but as of July 19, 2026, the additionally damaged structure had not been publicly specified. White said the injury was serious, that McGregor would need surgery, and that discussions about his next opponent or a return date made no sense at this point.
Confirmation of the diagnosis removed some of the uncertainty surrounding the unfortunate conclusion of the UFC 329 main event, held on July 11 at T-Mobile Arena in Las Vegas. At the very beginning of the fight, McGregor attempted a jumping kick, and his right knee gave way when he landed. He tried to continue but repeatedly lost his footing, after which Max Holloway took the initiative and attacked on the ground. Referee Mike Beltran stopped the fight after one minute and nine seconds of the first round, so Holloway was officially awarded a technical-knockout victory due to his opponent's injury.
From the initial suspicion to confirmation of an ACL tear
Immediately after the event, Dana White spoke about a suspected ACL tear, emphasizing that the final answer would come from magnetic resonance imaging and a medical examination. One week later, at the press conference following the UFC event in Oklahoma City, White asked Hunter Campbell for the latest information about the findings. Campbell replied that it was the ACL and added that there were two tears. White then described the condition of McGregor's knee very directly and confirmed that the former champion would have to undergo surgery.
The anterior cruciate ligament is one of the knee's key stabilizers, particularly during sudden changes of direction, rotations, and landings, movements that are an integral part of training and competition in mixed martial arts. The American Academy of Orthopaedic Surgeons states that the severity of the injury is determined through a clinical examination and imaging, and that complete tears in athletes who want to return to high-load activities often require ligament reconstruction. The procedure itself, however, is only one phase of the process. A return to elite sport depends on healing, restoration of the full range of motion, strength, knee control, and the ability to perform explosive movements without instability.
In McGregor's case, another unknown is the second injury Campbell mentioned but did not identify. Until a complete medical report or a more detailed statement from his team is released, it is impossible to say reliably whether another ligament, the meniscus, or some other structure is involved. For that reason, it is currently also impossible to responsibly determine a precise rehabilitation timeline. White made it clear that sporting plans would be discussed only when doctors allow McGregor to return to full training.
The comeback after five years lasted only 69 seconds
The fight against Holloway was supposed to mark McGregor's major comeback after a five-year absence. His previous appearance took place in July 2021 at UFC 264, when he broke his leg at the end of the first round of his third fight against Dustin Poirier. Surgery, lengthy rehabilitation, and years of uncertainty followed over whether the former two-division champion would ever compete again. In the buildup to UFC 329, the UFC placed precisely that story of a comeback from a serious injury at the heart of its promotion.
McGregor arrived in Las Vegas as a 37-year-old fighter and turned 38 three days after the event. In a sport in which reaction speed, explosiveness, and resistance to injury are crucial, another serious knee injury raises questions that cannot be reduced solely to the date of his next fight. His team must now assess the surgical plan, the course of rehabilitation, and the long-term functionality of the leg, while the UFC will wait for medical clearance before even considering a new date.
The official result remains a technical-knockout victory for Holloway, although the ending did not provide the sporting answer that the organizers, fighters, and audience expected from a rematch prepared for more than a decade. Holloway showed after the fight that he understood the seriousness of the situation, and according to his later account, McGregor wanted to continue despite the injury. However, the visibly compromised stability of the leg left the referee with little room for a different decision. Protecting the fighter's health takes precedence over the desire to continue, especially when an injured competitor can no longer stand and defend himself safely.
An unusual connection to their first fight in 2013
McGregor and Holloway first met on August 17, 2013, in Boston, at a time when both were only beginning to establish their status in the UFC. McGregor won by unanimous decision after three rounds, although he injured his anterior cruciate ligament during the fight. Thirteen years later, their second fight ended almost immediately, also because of a knee injury, but this time McGregor was unable to adjust his tactics and finish the bout.
That parallel further emphasizes how different the circumstances are. In their first meeting, he was younger, managed to complete the fight, and then continued his rise toward the featherweight and lightweight titles. He entered the rematch after the longest layoff of his career and following a previous serious leg injury. A new ACL rupture does not automatically mean the end of his career, but in combination with his age, the long period without competition, and the additional knee damage, it makes every comeback scenario considerably more complicated.
After UFC 329, McGregor said that he had not had an injury before the fight that would have hindered him. He stated that he had performed kicks normally during preparations and the warm-up and that the problem occurred suddenly. His coach John Kavanagh also rejected claims that the knee had represented a known risk before entering the Octagon. Available footage from the warm-up showed McGregor performing movements without an obvious limitation, but that footage alone cannot replace a medical report or definitively explain the mechanism of the injury.
Surgery and rehabilitation are now the only priority
With his latest statement, Dana White attempted to stop speculation about a possible new date, opponent, or final fight under the contract. According to him, McGregor must first undergo surgery and physical therapy, and only after doctors confirm that he may train at full intensity again can serious discussions about a return begin. Such a position means that, for now, the UFC will not build its calendar around a fighter whose medical recovery cannot yet be reliably predicted.
Rehabilitation after ACL reconstruction is not linear and is not based solely on the passage of a certain number of months. Doctors and physiotherapists monitor the reduction of swelling, mobility, quadriceps and hamstring strength, balance, control during landing, and the athlete's psychological readiness to load the injured leg again. For a professional MMA fighter, the requirements are even broader because the knee must withstand strikes, wrestling, level changes, takedowns, rotations, and uncontrolled situations in the clinch or on the ground. Any additional damage inside the joint may affect the surgical plan and lengthen the path toward full fitness.
For that reason, it would be premature to specify the month in which McGregor might compete again. The public often mentions approximate timelines for returning to sport after an ACL injury, but they vary considerably depending on the type of rupture, associated injuries, surgical technique, course of rehabilitation, and the criteria the athlete must meet. For the UFC and McGregor's team, objective testing of knee function will be more important than a predetermined date. White's message that a new fight will not be discussed before medical clearance reflects precisely that approach.
A trilogy with Holloway remains only a wish
After the unfortunate ending, McGregor expressed a desire to face Holloway for a third time so that their rivalry could receive a conclusion without an injury. Such a fight would have a clear promotional story: McGregor won the first meeting in 2013, Holloway won the second in 2026, but under circumstances that did not allow for a complete sporting contest. Nevertheless, White refused to enter into a discussion about a trilogy, saying that questions about a rematch made no sense while the fighter faced surgery and an recovery period of unknown length.
McGregor's contractual position further increases the uncertainty. According to reports from American MMA media, the fight at UFC 329 was supposed to be the first of two remaining obligations under his current arrangement, while McGregor himself spoke after the injury about his intention to complete his final contracted appearance. However, no date has been officially confirmed since the diagnosis, and plans mentioned earlier now depend on his health. Even if the recovery is successful, before booking a fight the UFC will have to assess whether McGregor can complete a full training camp and meet the commission's medical requirements.
Holloway, on the other hand, leaves UFC 329 with an official victory but without the opportunity to show how the fight would have developed under normal circumstances. His future does not necessarily have to be tied to waiting for McGregor. As a former featherweight champion and one of the most recognizable active fighters, he can continue his own path through major fights, while the possibility of a trilogy will remain open only if McGregor truly returns to competitive training.
The new injury changes the entire picture of McGregor's career
McGregor's sporting significance goes beyond the results of recent years. He was the first fighter in UFC history to simultaneously hold titles in two weight divisions, and his popularity had a significant impact on the organization's commercial growth and the global visibility of MMA. That is precisely why every attempt at his comeback generates interest far beyond the usual sports audience. However, superstar status cannot eliminate medical risks or shorten the biological process of healing the ligament and surrounding structures.
The loss to Holloway is statistically recorded as another negative result, but the more important question now is not McGregor's win-loss record, but whether his right knee can again reach the level of stability required for professional competition. Surgery will be the starting point, and the key answers will arrive gradually during rehabilitation. Only when McGregor can once again run, change direction, strike, wrestle, and complete full-contact training without limitations will discussion of a return have a real foundation.
Until then, only the most important facts remain confirmed: McGregor suffered an ACL tear and another, as yet unidentified, knee injury at UFC 329, he must undergo surgery, and the UFC will not plan his next appearance before the completion of the crucial phases of recovery. Everything else, including a possible trilogy with Holloway, the final contracted fight, and the ultimate continuation of his career, currently belongs to the realm of speculation.
Sources:
- UFC – official result of the McGregor – Holloway fight at UFC 329 and the stoppage time (link)
- UFC – official announcement of McGregor's decision to undergo surgery after the knee injury (link)
- UFC – official Dana White press conference after the UFC Oklahoma City event, at which the ACL injury and an additional tear were confirmed (link)
- MMA Fighting – Dana White's statement about surgery, physical therapy, and postponing discussions about the next fight (link)
- ESPN – report on the course of the fight, the stoppage after 69 seconds, and the connection to the injury from their first meeting in 2013 (link)
- American Academy of Orthopaedic Surgeons – expert overview of anterior cruciate ligament injuries, diagnosis, and treatment (link)