Pierce (calf) is inactive for Thursday's game against the Titans, Ryan O'Halloran of the Florida Times-Union reports.
Pierce likely suffered his injury on special teams during Sunday's win over the Ravens, as he didn't get any offensive snaps. In Pierce's absence, Toby Gehart (groin) will serve as the No. 3 running back.
Wide receiver Justin Blackmon , who hasn't practiced or played since 2013 after being suspended for the third time for violating the NFL's substance abuse policy, is unlikely to return to the Jaguars according to GM David Caldwell, per ESPN.com.
Quinn (hip) has been downgraded from questionable to out for Sunday's game in Baltimore, NFL.com's Ian Rapoport reports.
He has been bothered by the hip issue for over a month, and the Rams will hope that a week off gets him healthy enough to be a big factor down the stretch. Eugene Sims should see some extra snaps on the right side for St. Louis on Sunday.
Bailey has been suspended four games for violating the NFL Policy and Program for Substances of Abuse.
With Bailey -- who has recorded 12 catches for 182 yards and a touchdown in eight game to date -- set to miss time, it's now understandable that the Rams are expected to work out wideouts Hakeem Nicks, Wes Welker and Vincent Brown, per ESPN's Adam Caplan.