Steelers backup running back DeAngelo Williams underwent knee surgery Wednesday and could miss 4-6 weeks.
Williams, 33, has been dealing with knee inflammation the past couple of weeks and missed the game against the Patriots last month.
After the open week, Williams returned to play against the Ravens last week, albeit in a limited capacity. He had one carry for one yard. On Tuesday, head coach Mike Tomlin said Williams had his knee re-evaluated.
Williams hasn't been very involved in the offense since Le'Veon Bell came back from his three-game suspension to start the season. He's had nine carries in the four games he's played in since Bell returned.
Williams did rush for 257 yards and two touchdowns in the first three games of the season when Bell was out.
Fitzgerald Toussaint will serve as the backup running back against the Cowboys. Toussaint has four carries for 10 yards this season.
Mark Kaboly of DK on Pittsburgh Sports first reported that Williams underwent surgery.
