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The loss at UFC 257, Conor's first by knockout, all but ended the Notorious' dreams of a rematch with Khabib, who he lost to in 2018.
As well as the loss knocking the former lightweight champion down the pecking order to get a future title fight, Dana White revealed that Khabib had been left unimpressed and wasn't likely to come out of retirement.
That didn't stop the Eagle responding to Poirier's victory, taking to Twitter to say, "This is what happened, when you change your team, leave the sparring partners who made you a champion and sparring with little kids, far away from reality."
McGregor was asked about the Russian's comments in the post fight press conference and, unsurprisingly, the 32-year-old didn't take too kindly to the comments, calling them disrespectful.
Some will find irony in McGregor's words considering how nasty their rivalry became ahead of their meeting at UFC 229, starting with the Irishman attacking a bus his rival was on.
In the lead up to the Poirier rematch McGregor took a much more respectful tone with the Diamond, who he'd clashed with in the build up to their first fight over six years ago, and that continued after the fight.
"His leg kicks were good, my leg was dead and I wasn't as comfortable as I needed to be," the former lightweight champ said in the octagon. McGregor continued to be humble in a post press conference meeting with the victor.
White had claimed last week that Khabib, who retired after beating Justin Gaethje last year, would potentially return to action if any of the lightweights impressed him.
That led to Michael Chandler calling the undefeated Russian out following his impressive victory over Dan Hooker on his UFC debut, having previously been a champion in Bellator.
Whilst some may have been trying to impress the current champ, that certainly wasn't the case for Poirier.
"I'm not trying to impress Khabib!"- UFC on BT Sport (@btsportufc) January 24, 2021
"That's my girl, she's stuck it out with me, this win is a much hers as it is mine."@DustinPoirier isn't worried about what's next, he's just happy with what life has given him right now.
Always honesty from The Diamond :gem: pic.twitter.com/Xs09buVvto
It remains to be seen what exactly happens next with the lightweight division but for now at least it'll be going forward without Khaib.