The Rams placed Williams (hamstring) on injured reserve Thursday.
Williams pulled his hamstring in late July and will now miss at least the first four games of the season on injured reserve. It's a big blow to the Rams' cornerback group, one that was remade in the offseason with the pickups of Williams and Tre'Davious White as the team's projected starters. Derion Kendrick was already lost for the year to a torn ACL, and Cobie Durant is dealing with a hamstring issue of his own that has limited him in practice this week. The Rams have a road date with the Lions this coming Sunday night.