Conor McGregor was drug-tested four times in the weeks following Joe Rogan's joke that the UFC star could expect a visit "real soon".
McGregor has spent the last few months bulking up to 190lb as he recovers from the broken leg he suffered against Dustin Poirier.
His coach John Kavangh insists the Irishman will return to lightweight for his summer comeback despite piling on the pounds.
