The previously reported UFC 256 main event has been postponed due to Usman needing more time to recover from undisclosed injuries, sources said.
The UFC has already explored the possibility of Stipe Miocic versus Francis Ngannou for the heavyweight title becoming the new main event, but that appears to be a long shot at the moment, sources said.
This is the second time Usman versus Burns has been canceled. The first time came a little over a week before they were scheduled to fight at UFC 251 in July when Burns tested positive for COVID-19. As a result, Masvidal took the title fight on short notice and was ultimately defeated via unanimous decision by the champion, Usman.