Officially listed as "questionable" on the injury report, Jackson suffered the injury on his first carry of the season, a 47-yard touchdown run against the Philadelphia Eagles. Jackson had one more carry against the Eagles, but spent the rest of the opener on the sidelines and was inactive for Monday night's loss to the New York Giants.
This week, Jackson did not practice on Wednesday before being limited on Thursday and Friday.
"At least he (Jackson) got some work today and we'll see where we're at tomorrow," Spagnuolo told the St. Louis Post-Dispatch. "It may be a game-time thing."