Powerhouse Usman, who has impressed in his wins over Jorge Masvidal and Gilbert Burns so far this year, lured McGregor into a typically furious riposte in April, with the Irishman calling him "carbuncles" and a "big spotty back pox" in one of his hallmark incoherent rants.

'The Nigerian Nightmare' taunted McGregor over his potential to knock anyone out in his current lightweight division and even said that he "might take his life in there" if the most lucrative man in the sport stepped up.

Now the man McGregor accused of "copying my shots" has weighed in again, claiming that his adversary's status among fighters has fallen starkly from his previous pedestal.