Marcio Alexandre recently pulled out of his Ultimate Fighter 21 Finale bout against George Sullivan due to a rib injury and stepping up on short notice to meet Sullivan will be Dominic Waters. 
The fight change was initially reported by Fox Sports and Waters has confirmed he is facing Sullivan on social media.
The Ultimate Fighter 21 Finale will come from the MGM Grand Garden Arena in Las Vegas on July 12 and will be headlined by a welterweight bout as Jake Ellenberger meets Stephen Thompson.
Waters (9-2) is currently on a three fight winning streak and his most recent win came in March as he defeated Jack Montgomery by submission. Five of his nine wins have come by stoppage and three of those wins have come by TKO/KO. Sullivan (16-4, 1NC) made his UFC debut at the beginning of last year and started off with back to back wins in the promotion. His last fight came at UFC on FOX 15 and he was defeated by Tim Means.
The current fight card for The Ultimate Fighter 21 Finale is below.
Jake Ellenberger (30-9) vs. Stephen Thompson (10-1)
TBA vs. TBA – The Ultimate Fighter 21 Final
Jorge Masvidal (28-9) vs. Cezar Ferreira (8-4)
Michelle Waterson (12-4) vs. Angela Magana (11-7)
Josh Samman (11-2) vs. Caio Magalhaes (9-1)
Dan Miller (14-7, 1NC) vs. Trevor Smith (12-6)
Russell Doane (14-4) vs. Jerrod Sanders (14-3)
Willie Gates (11-5) vs. Darrell Montague (13-4)
Maximo Blanco (11-6-1, 1NC) vs. Mike De La Torre (13-4, 1NC)
George Sullivan (16-4, 1NC) vs. Dominic Waters (9-2)