It's after one competitor tested positive for covid-19.
U-F-C veteran Jorge Masvidal has been drafted in to take on Kamaru Usman in Abu Dhabi on Saturday night.
The 35-year-old will take on welterweight champion Usman at U-F-C 251, after the withdrawal of Gilbert Burns, who tested positive for Covid-19.
Masvidal has fought 48 times, and that record includes wins over Darren Till, Ben Askren and Nate Diaz.