Conor McGregor's UFC comeback has been put on hold -- the "Notorious" is OUT of his UFC 303 main event fight against Michael Chandler.
UFC honcho Dana White announced the devastating news late Thursday night -- just two weeks and a day before the scrap -- saying 35-year-old McGregor suffered an injury, and wouldn't be able to fight. The nature of the injury isn't known at this time.
38-year-old Chandler is also off the July 29th card ... as the UFC will now attempt to rebook the fight at a later date.