"We needed another body on defense because we're down on corners," Rams coach Steve Spagnuolo said following Monday's practice.
So St. Louis turned to Brown, a cornerback out of McNeese State who had been with the team's practice squad last season and was waived by the team earlier this year.
"When I first saw the caller (I.D.) when it popped up on my screen, I was wondering who was trying to play a prank call on me now," Brown said following practice. "It's great to be back out here and be in the midst of football. When you're not doing it, you miss it a whole lot. It's kind of tough to watch it on TV then."
Brown said he has been working out and staying in shape in case he got another opportunity with an NFL team, but he didn't know if that call would ever come.
"You don't know if you'll ever get a call, but once you get the opportunity you just take what God has dealt you or your faith has dealt you and you just go with the punches and stuff," Brown said. "Me knowing this system is easier, less thinking on me."
The Rams had been running out of cornerbacks. St. Louis had three key cornerbacks on the bench with either injuries or as precautionary measures on Saturday but then had two more, rookie Jerome Murphy and free agent signee Kevin Dockery, go down with injuries during the preseason game.
WESTBROOK SIGNS WITH 49ERS
The 30-year-old was limited to eight games last season because of concussions, his eighth year in the league, but has been a very productive running back in his time with the Eagles as both a runner and a pass-catcher. He has rushed for 5,995 yards and 37 touchdowns and has caught 426 passes for another 3,790 yards and 29 touchdowns.
Westbrook's best season came in 2007 when he rushed for 1,333 yards and seven touchdowns and caught 90 passes for 771 yards and five scores. He could have fit nicely with the Rams, who don't have a proven back-up running back behind Steven Jackson.
The 49ers developed a need for another running back with the abrupt retirement of youngster Glen Coffee recently.