The Rams signed Rivers to their active roster Saturday.
Rivers has gone back and forth between the practice squad and the active roster this season, and he's suited up in three games with the Rams, tallying nine carries for 21 yards and five catches for 29 yards. His signing to the active roster comes four days after Los Angeles waived former lead back Darrell Henderson. Rivers will likely work as the Rams' No. 3 ball carrier behind Cam Akers and Kyren Williams on Sunday against Kansas City.