That bout was scheduled to take place at UFC 201 in Atlanta later this month, Earlier this week, however, it was revealed Johnson would be unable to compete as a result of suffering an injury. Reis publicly expressed interest to stay on the card on Sunday and on Wednesday, his wish was fulfilled.
Santella, 31, is 15-5 in professional MMA. He's riding a two-fight win streak and has fought in Cage Fury Fighting Championships, Ring of Combat and more.
Reis, 31, enters this bout on just a one-fight win streak, but is 4-2 inside the Octagon. His record stands at 20-6.
UFC 201 takes place July 30 at the Philips Arena in Atlanta, Georgia.