At UFC 264 in Las Vegas, Conor McGregor suffered what seemed to be a significant leg injury while losing to lightweight contender Dustin Poirier by doctor's stoppage in the first round.

McGregor began aggressively by landing leg kicks on Poirier, but the American soon countered after hearing McGregor's leg break during one exchange.

Before the boxers returned to their feet, Poirier took his opponent to the mat, where he dominated.

Both swung and missed, and McGregor took a step back before his leg crumbled beneath him, raising the possibility of a bone fracture.

McGregor made it to the end of the round before the fight was stopped.

Poirier referred to his opponent as a "dirtbag" after the fight, which followed their January rematch.