Paulo Thiago is reportedly off the card as well, though the UFC has yet to confirm Thiago's removal. Tatame.com says Thiago suffered an elbow injury in wrestling practice and adds Nedkov is out due to VISA issues.
These changes affect Erick Silva, Mike Pyle, Fabio Maldonado and Edinaldo Oliveira, all of whom will need new opponents.
UPDATE: Gabriel Gonzaga will step in for Rob Broughton against Oliveira.
Headlined by Jose Aldo defending his UFC featherweight title against Chad Mendes, the current UFC 142 card is below.
Jose Aldo (Brazil) vs. Chad Mendes
Vitor Belfort (Brazil) vs. Anthony Johnson
Rousimar Palhares (Brazil) vs. Mike Massenzio
Erick Silva (Brazil) vs. TBA
Edson Barboza (Brazil) vs. Terry Etim
FX Preliminary Bouts
Thiago Tavares (Brazil) vs. Sam Stout
Fabio Maldonado (Brazil) vs. TBA
TBA vs. Mike Pyle
Ednaldo Oliveira (Brazil) vs. Gabriel Gonzaga
Felipe Arantes (Brazil) vs. Antonio Carvalho
Yuri Alcantara (Brazil) vs. Michihiro Omigawa