Detroit Lions starting cornerback Terrion Arnold will be sidelined indefinitely due to a shoulder injury, coach Dan Campbell said Monday.

The Lions are unsure whether Arnold’s injury is season-ending, Campbell said. Arnold was hurt during the Lions’ 37-24 victory at Cincinnati on Sunday. He finished with a tackle and two passes defended.

“Unfortunately, he’s going to be out for a while,” Campbell said. “He’s going to be out for a long time.”

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Arnold was officially ruled out in the fourth quarter against the Bengals after being carted off the field. He also left last week’s game against the