Could a Conor McGregor vs. Dustin Poirier rematch actually happen?? Diamond tells TMZ Sports ... "anything is possible."
We talked to the 32-year-old UFC star as he was leaving T-Mobile Arena following his trilogy fight victory over McGregor ... and we asked if Dustin was interested in a 4th fight.
"Anything is possible. I just have to get with my family, and see what's next."
Of course, Conor -- who underwent successful 3.5 hours surgery yesterday to repair his broken leg -- is facing a long and arduous rehab process.