Neither Jackson (groin) nor Atogwe (thigh) participated in practice on Wednesday or Thursday. The Rams likely won't know whether either player will be available until minutes before Sunday's game against the visiting Seattle Seahawks at the Edward Jones Dome.
"Sunday we'll definitely go out before the game, warm up, see how I feel," Jackson said on Thursday. "Ideally I would like to get a practice in either (Friday) or Saturday. So we still have two days of practice that I could go out and try it, but say Friday or Saturday it doesn't happen, I will be there early Sunday seeing if I can run and cut and seeing if I can go out there and give my team a lift."
One of the issues Jackson and the Rams are dealing with is whether to risk further injury this week or sitting out this game so he can be healthier later on.
"There are a lot of things involved here," Spagnuolo said on Thursday. "It's the fourth game of the season. It's a running back with a lower-extremity injury. We want him out there. I know he wants to be out there. But you certainly don't want to have the setback. You want to get him healthy. That's what you want to do. Those are all things we'll be faced with on Sunday morning."
If Jackson can't go or is limited, backup Kenneth Darby will get a bulk of the work in the backfield with rookie Keith Toston and Chauncey Washington, added this week off the New York Jets practice squad, possibly getting some work.
Darby has rushed for 51 yards on 17 carries, an average of 3 yards per carry, and has scored one touchdown this season. Toston has rushed 11 times for 22 yards.
"My level (of confidence) has always been high and certainly last week proved that he could carry that kind of load," Spagnuolo said of Darby on Thursday. "A lot of it falls on the other guys around them, especially the offensive line. Then being creative on offense and finding ways to score points."