Cooper caught three of five targets for 24 yards in Sunday's 20-17 win over the Chargers, but he suffered a rib injury on his final catch late in the fourth quarter, Michael Gehlken of The Dallas Morning News reports.
Cooper's 12-yard grab, in which he split two defenders but took a shot to the ribs as he cut between them, helped set up a 56-yard game-winning field goal by Greg Zuerlein. The receiver's tepid numbers were reflected in a quiet day for the Dallas passing game as a whole, but if the injury isn't serious, Cooper will look to rebound in Week 3 facing an Eagles defense he has averaged over 91 yards a game against in six career meetings since coming to the Cowboys.