PITTSBURGH -- Two more Pittsburgh Steelers defensive linemen were added to the injury report on Friday, and a banged-up position got even thinner.

Defensive tackle Cam Hayward has a knee injury and did not practice. He previously was not listed with an injury to start the week but often has rest days built in. Still, any injury designation for the star is a worrying sign with Derrick Harmon , who was optimistic about potentially returning this week, out of practice for the second straight day.

In addition to that, rookie Yahya Black, who has stepped up into a bigger role with the injuries, has a shoulder injury and did not practice. Head coach Mike Tomlin noted that Black would be limited to start this week, but he practiced fully yesterday, taking a step back in his participation

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