The Los Angeles Rams made a pair of roster moves ahead of Sunday's game against the Arizona Cardinals. The Rams announced Saturday that they have activated third-round rookie Keagen Trost off of injured reserve and promoted cornerback Cam Lampkin from the practice squad.

Trost had been on IR all season, missing the first five games with a hamstring injury that he suffered in the first quarter of the Rams' preseason opener in August. Now that he's been activated, he could provide much-needed depth at offensive tackle while Alaric Jackson serves his one-game suspension.

Lampkin has been promoted from the practice squad again, which could be an insurance policy in case Trent McDuffie is unable to play due to his groin injury. Lampkin's elevation doesn't mean McDuffie will be out, but it's certainly a backup plan for Los Angeles.

The Rams could always make Lampkin inactive, as they did once before this season.

Los Angeles squares off with the Cardinals at home on Sunday, with kickoff set for 4:05 p.m. ET. If Trost is active, it will be his first NFL game.