Conor McGregor has told Khabib Nurmagomedov “the world knows this war is not over” as he hinted at a future confrontation if his long-standing foe avoids a rematch.

The pair’s storied grudge escalated when Nurmagomedov retained his UFC lightweight title by forcing McGregor to tap in the fourth round of their October 2018 bout, after which a post-fight melee involving both combatants ensued.

McGregor has made it known he would relish a chance to avenge the loss but Nurmagomedov announced his mixed martial arts retirement last October after extending his perfect professional record to 29-0 by defeating Justin Gaethje.

Poirier (26-6) put together an impressive streak before coming a cropper against Nurmagomedov and rebounded from the setback by beating Dan Hooker by decision last June.

“I’m very happy to be here,” McGregor added. “Dustin has put on an incredible run since our last fight, it’s been a long time coming.

“Yes, I did get the win over him the first time but he’s rose right up and he’s back up there at the top of the division, so I’m excited to compete with him again.”