UFC officials announced on Tuesday that Miller had to withdraw from the bout due to tearing ligaments in his thumb during training. He is apparently now in a full cast.
Moving swiftly, the UFC enlisted Diego Brandao to take Miller’s place.
“Diego Brandao is explosive and a well-rounded fighter. This should be a war,” said UFC president Dana White.
McGregor (14-2) shot into the limelight after an impressive debut at UFC Stockholm: Latifi vs. Mousasi in early 2013 and followed that up with a second consecutive victory in the Octagon later that year.
He since suffered an ACL tear, which has kept him sidelined for the better part of the past year, but recently gained clearance to headline the show in his home country.
Brandao (18-9) recently had to withdraw from The Ultimate Fighter Brazil 3 Finale due to an undisclosed injury, but apparently will be ready to go by the time UFC Dublin takes place on July 19.
He enters the fight with McGregor coming off of a knockout loss to Dustin Poirier, which ended a three-fight winning streak.