NFL Media Insider Ian Rapoport reported Friday that Foster is a long shot to play Sunday, per a source informed of his injury.
If indeed Foster isn't able to go, it's a big blow to quarterback Ryan Mallett in his first career NFL start.
Expect rookie running back Alfred Blue to carry the load in Foster's stead. Blue ran for 78 yards on 13 carries in his one start (against the New York Giants, Week 3) replacing Foster earlier this season. However, he's not nearly as explosive as the veteran and has been stymied for most of the season (3.4 yards per carry).