Matt Brown will step up on short notice and replace the injured Matt Riddle against Ryan Thomas at UFC 91: "Couture vs. Lesnar" at the MGM Grand Garden Arena in Las Vegas, Nevada, on November 15, according to WrestlingObserver.com.
Riddle -- The Ultimate Fighter (TUF) 7 cast clown -- reportedly suffered a serious knee injury while training for the welterweight bout and there is no timetable for his return to action at this time.
Brown also competed on TUF 7 before being eliminated from the show by eventual tournament winner Amir Sadollah via triangle choke in the semifinals. He bounced back to defeat Matt Arroyo via technical knockout at the TUF 7 Finale in June.
The taste of victory inside the Octagon, however, did not last long -- Brown dropped a close split decision to undefeated Korean import, Dong Hyun "Stun Gun" Kim at UFC 88: "Breakthrough" in Atlanta, Ga., on September 6,
It marked his fourth loss in his six most recent fights.
Thomas is no stranger to last minute opponent switches -- he stepped up on short notice (12 days) to replace an injured Jared Rollins at UFC 87: "Seek and Destroy" in August to fight Ben Saunders.
He lost that fight via second round submission (armbar), spoiling his debut for the promotion.
Thomas is a 23-year-old part-time student at Eastern Illinois University who, prior to taking the Saunders fight, fought 14 times in 20 months.
To check out the latest UFC 91 fight card and rumors click here. And to purchase tickets for "Couture vs. Lesnar" click here.