Promotional newcomer Adam Khaliev (6-0) and Pascal Krauss (11-2) both withdrew from their scheduled welterweight bout at UFC on FOX 10, promotion officials announced Saturday.
A replacement fight is currently in the works for the now 10-fight card.
An undefeated Russian prospect, Khaliev is most known for his ferocious tornado kick knockout of Alexei Belyaev in 2011.
Krauss, meanwhile, has split his four UFC appearances, outpointing Mark Scanlon and Mike Stumpf, and falling short against John Hathaway and Hyun Gyu Lim.
UFC on FOX 10 takes place January 25, 2014 at the United Center in Chicago, Illinois. An updated fight card can be seen below.
Main Card (FOX)
Benson Henderson vs. Josh Thomson
Gabriel Gonzaga vs. Stipe Miocic
Donald Cerrone vs. Adriano Martins
Darren Elkins vs. Jeremy Stephens
Preliminary Card (FOX Sports)
Alex Caceres vs. Sergio Pettis
Yves Jabouin vs. Eddie Wineland
Chico Camus vs. Yaotzin Meza
Ramiro Hernandez vs. Hugo Viana
Daron Cruickshank vs. Mike Rio
Preliminary Card (UFC Fight Pass)
Walt Harris vs. Nikita Krylov