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It's Week 2, and injuries already are testing Detroit Lions' thin depth

Jeff Okudah wasn't the only starter the Detroit Lions lost to injury in their season-opening loss to the San Francisco 49ers on Sunday.

Lions coach Dan Campbell said No. 1 receiver Tyrell Williams is in concussion protocol after leaving the game following a helmet-to-helmet hit in the third quarter.

Williams retreated to the locker room, accompanied by trainers, following the play. He returned to the bench area a few minutes later, but never re-entered the game.

The Lions relied heavily on tight end T.J. Hockenson and running backs D'Andre Swift and Jamaal Williams in the pass game Sunday, even before Tyrell Williams' injury.