Munhoz was forced to withdraw from the July 15 fight on Yas Island in Abu Dhabi after testing positive for COVID-19, sources say.
UFC is trying to convince Frankie Edgar to take a replacement fight, and the talks are ongoing regarding whether Edgar will remain on the card, sources said.
The positive test was revealed before both fighters were set to travel from Las Vegas to Abu Dhabi Monday night. Sources say Munhoz is feeling good at this time.
The fight signaled Edgar's long-awaited bantamweight debut. The former UFC lightweight champion was supposed to debut at 135 pounds in January against contender Cory Sandhagen, however, he decided to delay his move down to bantamweight to take a short-notice fight against Chan Sung Jung instead.
Edgar will now have to wait a little longer to fight at 135. At this time, it's unclear when he'll fight again. That loss marked Edgar's third in his last four. His last victory came in April 2018 when he defeated Cub Swanson via unanimous decision.
Munhoz (18-4, 1 NC) hasn't fought since his unanimous decision loss to Aljamain Sterling in June 2019. That loss snapped a three-fight winning streak for the Brazilian.