Bears RB Kevin Jones suffered a torn ligament in his left ankle in the first quarter of Thursday night's game at Soldier Field.
Jones has been informed that he will require surgery to repair the injury, and the rehabilitation process will take up to 10 months.
This means the veteran will be out for this season.
Garrett Wolfe and Adrian Peterson will serve as the backups to starter Matt Forte. This increases the chances tight end Michael Gaines will make the roster, although the Bears could go out in search of another back.