The Dallas Cowboys fear that running back Lance Dunbar's injured left knee will require season-ending surgery, ESPN reported Friday.
Dunbar was injured in the fourth quarter of Thursday's win over the Oakland Raiders. The Cowboys initially diagnosed the injury as a sprain. The Dallas Morning News reported that Dunbar was scheduled for an MRI on Friday.
If Dunbar has surgery, he is expected to need three months to recover.
Dunbar rushed for a game-high 82 yards on 12 carries against Oakland.