ST. LOUIS (AP) -- Steven Jackson's status is day to day after the nine-year veteran sat out his second consecutive practice Thursday with a groin injury.
The same problem forced him to miss most of St. Louis' 31-28 victory over Washington on Sunday and he is a game-time decision for Sunday's game at Chicago.
Jackson said he first felt tightness on a 20-yard run with about 12 minutes left in the first half against the Redskins. He had three more carries before exiting, finishing with 58 yards on nine carries.
If he doesn't play, rookie Daryl Richardson is expected to start. Richardson, a seventh-round pick out of Abilene Christian, took Jackson's spot last Sunday and finished with 83 yards on 15 carries. He had just two carries for 20 yards in the season opener at Detroit.