Colts running back Trent Richardson was unable to practice on Friday because of an illness. He was officially listed as questionable for Sunday's wild-card clash against the Bengals, according to the team's official website.
Richardson rushed for 519 yards and three touchdowns on 159 attempts, the most he's compiled since his rookie season with the Browns. If he is unable to play, the team will likely shift to Dan Herron and No. 3 back Zurlon Tipton to handle all running back duties.
The Colts opened as a 6-point home favorite. The line has dropped to 3 points as of Friday, per VegasInsider.com.