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Poirier accused McGregor of cheating after he won their trilogy bout at UFC 264 last weekend.
The American leads the Irishman 2-1 in their series thanks to a doctor's stoppage following the Notorious' sickening leg break.
But before McGregor snapped his tibia, he was involved in a controversial moment.
The former UFC double champion had his fingers in Poirier's glove and pulled him down into up-kicks.
'The Diamond' told Dean, but to no avail as he eventually let him back up to his feet.
A clip has since surfaced online of McGregor's antics following Poirier's accusations in the post-fight press conference.
On McGregor's tricks inside the Octagon, Poirier said: "I let him up because he had three fingers in my glove, the cuff of the tape, so it's a good grip, and he's pulling me down into up-kicks.
"He's pulling me down and kicking up at the same time. I'm not surprised that he does that kind of stuff.
"I was telling Herb, I can't get out of it!"
McGregor has since undergone surgery on his leg and says he feels 'tremendous' as he insists he will come back better than ever.
"Just out of the surgery room, everything went to plan," the 32-year-old said. "Everything went perfect, I'm feeling tremendous.
"We've got six weeks on a crutch now and we begin to build back. I want to thank all the fans all the way around the world for your messages of support.
"I hope you enjoyed the show. I want to thank all the fans in attendance at the T-Mobile Arena, 21,800 fans in attendance. The place was absolutely electric.
"It was a hell of a first round. It would have been nice to get into that second round and then see what's what. But it is what it is. That's the nature of the business.
"A clean break of the tibia and it was not to be. Dustin, you can celebrate that illegitimate win all you want, but you've done nothing in there.
"That second round would have shown all. Onwards and upwards we go. We dust ourselves off, we build ourselves back, and we come back better than ever."
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