CINCINNATI(AP) The Cincinnati Bengals waived running back Kenny Irons on Friday after he failed a physical examination earlier this week.

Irons tore a left knee ligament during a preseason game at Detroit in August. The 24-year-old from Dacula, Ga., spent the season on the injured list.

If no other team claims his rights, the Bengals could re-sign Irons and put him on a reserve list. But he would not be eligible to play this season.

Irons was a 2007 second-round draft choice from Auburn.

The team's remaining running backs include starter Rudi Johnson, followed by Kenny Watson, Chris Perry and DeDe Dorsey.