NFL Network's Ian Rapoport reported Ridley's agreement with the Broncos.
Ridley offers the Broncos insurance at running back after Rapoport reported Devontae Booker suffered a fractured wrist which he aggravated while training for the season.
Per ESPN's Jeff Legwold, Broncos head coach Vance Joseph said Booker will undergo surgery and is expected to miss six weeks.
Ridley, 27, has spent time with the Detroit Lions, Indianapolis Colts and Falcons in 2016. He was released by the Lions and Colts before the season started and linked up with Atlanta on Oct. 23. After carrying the ball three times for seven yards in his only appearance with the Falcons, he was released Nov. 23.
The Broncos are Ridley's fifth team since leaving the New England Patriots after the 2014 campaign. He carried the ball 36 times while a member of the New York Jets in 2015, recording a career-low 90 yards. A 1,200-yard rusher in 2012 with the Patriots, Ridley's career has been undone by injuries—particularly a torn ACL and MCL in 2014.
"My body feels good," Ridley said last July, per Justin Rogers of the Detroit News. "I've done the therapy, I've done the rehab. There's nothing to do now but come out here and play. I'm going to let my play speak for itself before I say I'm back."
The Broncos are well stocked with depth at running back, including C.J. Anderson and Jamaal Charles, so it could be difficult for Ridley to play a significant role.
This does give Ridley an opportunity to showcase his skills for the Broncos, while also showing other teams around the NFL that he can stay healthy. It's a solid low-risk addition for Denver at this point in the offseason.