UFC officials added the bout on Thursday.
Palhares (14-5) has his back against the wall heading into this fight. He is coming off of back-to-back losses to Hector Lombard and Alan Belcher. The Brazilian is also coming off of a nine-month suspension for testing positive for elevated levels of testosterone following the loss to Lombard.
Pierce (17-5), however, is on a hot streak, winning his four most recent fights. He most recently defeated David Mitchell at UFC 162 in May, and is now knocking on the door of a Top 10 ranking.