OWINGS MILLS, Md. -- The Baltimore Ravens signed free-agent cornerback Antoine Cason to help a depleted secondary.

The Ravens were down to three healthy cornerbacks -- Lardarius Webb, Asa Jackson and Rashaan Melvin -- after Danny Gorrer suffered a season-ending knee injury and Anthony Levine sustained a concussion in Sunday's 28-13 win in Miami.

Cason, 28, is a four-year starter in the NFL who was cut by the Carolina Panthers last week. He has two interceptions and six passes defensed, but he has given up six touchdowns in 12 games this season, according to Pro Football Focus.

The Ravens could use Cason in their rotation at nickelback along with safety Matt Elam. Gorrer, who was placed on injured reserve to make room for Cason, played 25 snaps last Sunday in Miami.

Cornerback has been a problem all season for the Ravens. They've started six cornerbacks in 13 games and lost Jimmy Smith, their top corner, to a season-ending foot injury in October.