Jorge Masvidal will face Kamaru Usman in the headline bout at UFC 251 in Abu Dhabi on Sunday.
He replaced Gilbert Burns in the last-minute after he reportedly contracted coronavirus.
Masvidal and Usman have both tested negative for COVID-19 and will now fly to Abu Dhabi on Monday.
Alexander Volkanovski will defend his belt in a rematch against Max Holloway, while Petr Yan and Jose Aldo will battle for the bantamweight crown.
The UFC 251 and Fight Nights (on July 16, 19 and 26) will take place at Flash Forum.