Burgos (15-3) was scheduled to face Moraes (23-10-1) in a featured bout on PFL's inaugural pay-per-view event in New York. Moraes will remain on the card against Sheymon Moraes. The nature of Burgos' injury was not disclosed.
It's an unfortunate development for the card, as Burgos, 31, represents one of PFL's biggest free agent acquisitions in recent years. He signed with the PFL earlier this year, ending a five-year run in UFC.
Moraes, of Brazil, announced his retirement from MMA in March, following his fourth consecutive defeat in the UFC, but elected to cut that retirement short for this opportunity. Both he and Burgos are expected to be part of the PFL's 2023 season.