Cooper sustained a back injury while training, which forced him to withdraw from the Sept. 19 card at the Save Mart Center in Fresno, Calif.
Rogers was first tapped to fight James Irvin on the upcoming card, but Irvin sustained an injury that forced him out of the fight. He was shortly after replaced by Cooper.
Now that Cooper had to bow out, Rogers will have to prepare for yet another foe on just 10 days notice.
Bellator 125 is scheduled to be headlined by a middleweight fight between Melvin Manhoef and Doug Marshall.
The entire Bellator 125 card is currently listed as follows:
Doug Marshall (18-7) vs. Melvin Manhoef (28-11-1)
Rafael Carvalho (9-1) vs. Brian Rogers (11-6)
Martin Stapleton (13-3) vs. Goiti Yamauchi (17-2)
Javy Ayala (7-3) vs. Raphael Butler (8-0-1)
Ron Keslar (11-6) vs. Jesse Juarez (21-9)
Aaron Wilkinson (11-6) vs. Chris Honeycutt (4-0)
Julio Cesar Neves (29-0) vs. Poppies Martinez (29-10)
Granson Clark (2-1) vs. George Zuniga (2-0)
Jonny Bonilla-Bowman (2-0) vs. Sergio Cortez (9-8)
Oscar Ramirez (3-1) vs. Matt Ramirez (debut)
Joe Neal (3-0) vs. Paul Ruiz (5-1)
Nate James (13-8) vs. Anthony Ruiz (33-18)