The Steelers are going to be down three defensive players, including two starters, for the home opener against the Seahawks on Sunday afternoon. Defensive lineman Derrick Harmon, safety DeShon Elliott and linebacker Malik Harrison will not play.

Harmon is still recovering from the knee sprain he suffered in the final preseason game, while Elliott and Harrison were injured in the season-opening victory against the Jets.

Coach Mike Tomlin said starting cornerback Joey Porter Jr. is questionable, and he’s hopeful outside linebacker Nick Herbig can return after he missed the Jets game with a hamstring injury.

The Steelers’ defensive depth will be tested against the Seahawks, but they are deeper than they have been in recent years. Chuck Clark, who was signed early in training camp, is expec

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