The Rams brought WR Austin Pettis back to the 53-man roster on Tuesday and placed OG Rokevious Watkins on injured reserve.
Pettis served the final two games of a four-game suspension for violating the league’s policy on performance-enhancing drugs.
Pettis took part in meetings with the team on Monday. He had 27 catches for 256 yards last season as a rookie.
Watkins, a rookie, suffered an ankle injury late in Week One.