ALLEN PARK — At several points in the last few months, Detroit Lions cornerback Terrion Arnold has suffered an injury, only to bounce back and be ready to play the following week.

The shoulder injury that knocked him out of Sunday’s win against the Cincinnati Bengals is not such a case.

Lions coach Dan Campbell on Monday said Arnold’s shoulder injury will force him out of action for “a long time.” Campbell is uncertain whether the injury is season-ending, but he didn’t seem too optimistic about his chances of returning this season.

“Unfortunately, he’s going to be out for a while, he’s going to be out for a long time,” Campbell said. “I don’t know (if it’s season-ending), but it’ll be a while. It’s gonna be a while.”

Arnold exited last week’s game against the Cleveland Browns with a sh

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