The Detroit Lions promoted cornerback Chris Greenwood from the practice squad with rookie cornerback Darius Slay ruled out with a knee injury.
Greenwood was drafted in the fifth round by Detroit last year.
He was with the Dallas Cowboys before being released and re-signed by Detroit.
The Lions cut wide receiver-kick returner Micheal Spurlock.
Follow me on Twitter: @RavensInsider
Aaron Wilson covers the Ravens for The Baltimore Sun.