The Rams, looking to bolster their secondary in the wake of Trumaine Johnson's ankle injury, claimed former Jacksonville Jaguars cornerback Dwayne Gratz off waivers Tuesday.
Defensive lineman Morgan Fox will return to the practice squad if he clears waivers.
Johnson was injured last Sunday during the Rams' 30-19 defeat by the Buffalo Bills. Coach Jeff Fisher is scheduled to address Johnson's status after practice, but the franchise cornerback is expected to be sidelined for Sunday's game at Detroit and possibly the Rams' Oct. 23 game against the New York Giants in London.
The Rams' next home game is Nov. 6 against Carolina.
Gratz, a fourth-year pro from Connecticut, started eight games in 2013 and 10 in 2014. He has three career interceptions. He was put on waivers Monday when the Jaguars added cornerback Aaron Colvin, who returned from a suspension.
The Rams released cornerback Coty Sensabaugh, who reportedly is about to sign with the New York Giants, and added Fox to the roster last week to add depth to a defensive line that was without injured Robert Quinn, William Hayes and Michael Brockers.