Conor McGregor has vacated the featherweight title, ending his reign as a two-division champion, UFC has confirmed.
By knocking out Eddie Alvarez to win the lightweight title at UFC 205 in New York, McGregor became the first fighter in UFC history to hold two belts at the same time.
However, McGregor has relinquished his 145-pound strap, with UFC confirming that Jose Aldo - who the Irishman knocked out in 13 seconds to win the belt in December 2015 - has been promoted from interim to undisputed featherweight champion.
The interim belt will be on the line when Max Holloway faces Anthony Pettis in the new main event at UFC 206 on December 10, the bout replacing the previously scheduled fight between light heavyweight champion Daniel Cormier and Anthony "Rumble" Johnson, with the winner set to take on Aldo next year.
Cormier pulled out of the clash with Johnson due to an undisclosed injury.