​Revisiting Conor McGregor’s Last Fight: A Look Back at the 2021 KO Loss to Dustin Poirier and the Lingering Aftermath originally appeared on NESN. Add NESN as a Preferred Source by clicking here. Conor McGregor hasn’t stepped into the octagon for roughly five years, and many Irish fans would like to forget his most recent bout from July 2021, a contest that not only damaged his health but also altered his standing in the sport. The defeat to Dustin Poirier at UFC 264 came to a dramatic, painful end when McGregor suffered a broken tibia, leaving Poirier with a 2-1 edge in the series against the “Notorious” One. In Las Vegas, more than 20,000 fans gathered at the arena to witness McGregor’s attempt to reclaim his form, a night that left a bitter memory for the superstar.
McGregor has remained out of action since the Poirier clash. He underwent surgery and redirected his focus toward business ventures, explored a political foray, and engaged in several legal proceedings. He also teased a future matchup with Michael Chandler. Despite the upheaval surrounding him, the hunger to compete persisted, and he eventually returned to face Max Holloway at UFC 329. Yet before turning the page to that bout, it’s essential to reflect on the Poirier confrontation at the T-Mobile Arena—the fight that reshaped the trajectory of McGregor’s career.
NESN revisits Conor McGregor’s most recent opponent and the fight that altered his path. Poirier (30-10, 1 NC) stands as one of the most accomplished fighters who has never captured a UFC title, tied to numerous UFC records, including the second-most Fight of the Night bonuses (10) and a high tally of finishes (6) against current, former, or future champions. Hailing from Lafayette, Louisiana, “The Diamond” turned pro in 2009, carving out his path through WEC before making his UFC debut in 2011, a year in which he suffered an early career loss to Holloway. He also dropped a decision to McGregor in 2014.
Following that initial setback, Poirier embarked on an extended winning streak, defeating fighters like Jim Miller, Anthony Pettis, Justin Gaethje, Eddie Alvarez, Holloway (in a rematch), Dan Hooker, and Michael Chandler. Poirier also tallied a knockout victory over McGregor at UFC 257 in July 2021, then again prevailed at UFC 264 a few months later. Although he briefly held interim status and came close to lightweight gold against Khabib Nurmagomedov, Charles Oliveira, and Islam Makhachev, he did not clinch the title. After a trilogy loss to Holloway for the BMF belt, Poirier stepped away from pursuit of the belt, signaling a period of transition in his career.
In the trilogy’s pivotal moment, McGregor sought to alter the outcome by changing his approach. He launched the fight with a plan to employ leg kicks—the same tactic that had troubled him in the second Poirier bout. Poirier remained unfazed, delivering his own leg kicks and answering with powerful right hands. As the round wore on, both fighters connected with combinations. Poirier attempted a takedown, prompting McGregor to respond with a guillotine attempt, a sequence that underscored the intensity and high stakes of the matchup. The fight’s unpredictable momentum carried through, with each exchange contributing to the sense that the path to victory could swing in an instant.
The 2021 encounter at UFC 264 remains a defining moment in MMA history, not only for the physical toll it exacted on McGregor but also for the shift in momentum it represented within the sport. The aftermath of McGregor’s injury extended beyond the cage, shaping his career trajectory and keeping fans and pundits alike debating the implications for years to come. As Poirier continued to build his legacy in the years that followed, McGregor’s journey outside the ring—recoveries, business endeavors, and occasional speculation about potential fights—offered a narrative as compelling as the bouts themselves.
Reflecting on that night in Las Vegas and the longer arc of McGregor’s career provides insight into the resilience and unpredictability of combat sports. It serves as a reminder that even the most dominant competitors can face unforeseen setbacks and that the road back often involves a combination of conditioning, strategy adjustments, and the support of a devoted fan base. The Poirier fight stands as a watershed moment—one that reshaped perceptions, altered careers, and continues to influence discussions about legacy, comeback potential, and the ever-evolving landscape of mixed martial arts.