Colby Covington has labelled Conor McGregor a "conman" and said it was "laughable" the Irish star is trying to compete for the welterweight title.
McGregor called out reigning welterweight champion Kamaru Usman after he successfully defended his title against Jorge Masvidal last month.
Covington suggested the UFC star should forget about moving to 170lb after being defeated by Dustin Poirier by knock-out in January.
The pair will take to the octagon again in July for a trilogy fight with McGregor havinh defeated Poirier in their first bout in 2014.
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