The team likely will not know his status until he hits the field for pregame warmups, according to Jamey Eisenberg of CBS Sports. He is officially listed as questionable.
Spiller limped off the field last week against the Ravens after he twisted his ankle during an ugly fall. He was able to return to the field and finish the game, though it seems swelling after the fact has worsened the injury.
The fourth-year back has been a limited participant in practice this week.
Spillers's backfield-mate, veteran halfback Fred Jackson, also went down with a leg injury last week before returning to the game. He is listed as probable for Thursday night.