The UFC on FX 8 card from Brazil has undergone some surgery this week, as two bouts have been changed.

First, Chris Camozzi will face Cezar Ferreira after an injury knocked C.B. Dollaway from the bout.

Camozzi (19-5) has gone 6-2 inside the Octagon, including a recent win over Nick Ring.

Ferreira (5-2) was a winner of The Ultimate Fighter: Brazil.

Also, Marcos Vinicius has been knocked out of a scheduled fight with Yuri Alcantara. UFC officials are looking to replace Vinicius, but have yet to announce a new opponent for Alcantara.

The event takes place May 18 from the Arena Jaragua in Brazil. Luke Rockhold debuts in the UFC vs. Vitor Belfort in the main event.