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Khabib defended his lightweight title by forcing bitter rival McGregor to tap out to a neck crack in the fourth round of the bout at the T-Mobile Arena in Las Vegas.
However, the Dagestani fighter was extremely angry that he lost one of only two rounds in his perfect career, against McGregor - as the judges gave the third round to the Irishman.
'The Notorious' fighter produced a plethora of illegal strikes that went unpunished, grabbed Khabib's hands and held onto the cage, while Dean was heard shouting "don't grab the shorts" at one point.
Years on from the 2018 encounter, it still irks Khabib. During a meeting with Dean backstage at a UFC event, 'The Eagle asked: "Coach, how much do you think they paid him?" - to which his coach replied: "I don't know; Herb, how much?"
Dean said: "I was trying to do a good job."
The coach continued, asking: "Were you well-compensated, though?"
Dean, who was 2-3 in MMA before he became an official, replied: "That's the thing; I've never been well-compensated."
Khabib finished by saying, "Coach, it's okay I forgive him".
In October 2020, two years on from the Las Vegas bout, McGregor was boasting about his illegal knee strike to Khabib and said the maneuver should be 'legalised'.
With what happened in the build-up to the fight, and the explosive aftermath, there's still very much huge animosity between both men.