Originally written on 5thRound.com  |  Last updated 10/24/14

An undisclosed injury has forced Amir Sadollah out of his UFC 143 scrap against Jorge Lopez. Matt Riddle (Pictured), who was forced to withdraw from UFC 141 at the last-second due to illness, has agreed to serve as substitute.

Riddle has lost two straight scraps and could be fighting for his Octagon life on February 4th. He was slated to meet Luis Ramos until he became sick after warmups.

Lopez made his big league debut in September at “UFC Fight Night 25.” Wanderlei Silva’s protege had his 10-fight winning streak snapped by dropping a unanimous decision to Justin Edwards.

The Mandalay Bay Events Center in Las Vegas, Nevada hosts the festivities.

A interim welterweight title tilt between Nick Diaz and Carlos Condit headlines the pay-per-view broadcast.

Here is the card’s updated roster:

Dustin Poirier vs. TBD

Rafael Natal vs. Michael Kuiper

Justin Edwards and Mike Stumpf

Ed Herman vs. Clifford Starks

Matt Brown vs. Chris Cope

Jorge Lopez vs. Matt Riddle

Alex “Bruce Leeroy” Caceres vs. Edwin Figueroa

Scott Jorgensen vs. Renan Barao

Roy Nelson vs. Fabricio Werdum

Josh Koscheck vs. Mike Pierce

Carlos Condit vs. Nick Diaz (Interim UFC Welterweight Title)

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