The Cowboys fear running back Lance Dunbar will miss the rest of the season with torn ligaments in his left knee. He was injured during a kickoff return to start the second half.
Dunbar will undergo an MRI on Monday.
“I don’t like it,” Cowboys owner Jerry Jones said after the game. “It doesn’t sound good. They’ll go back and do more technical evaluation of it, but I don’t like the way it sounds.”
Dunbar entered the game tied for the team lead in receptions with 21 and with a team-leading 215 receiving yards. He had a 45-yard run Sunday and finished with three rushes for 54 yards. He did not have a reception.
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He missed the final four games of the 2013 season when he needed surgery to repair a posterior later corner in his left knee.
Dunbar played in all 16 games last season, though he had a limited role.
The Cowboys already have a replacement on the roster. They traded for Christine Michael in a Sept. 6 deal with Seattle. The former Texas A&M standout made his Cowboys’ debut Sunday with one carry for minus-1 yard.
If Dunbar goes on injured reserve, the Cowboys will have to make only one other roster move to get Rolando McClain and Greg Hardy activated. McClain and Hardy return Monday from four-game suspensions, though the Cowboys don’t have to activate them immediately.