The Dallas Cowboys made it official, placing offensive guard Brian Waters on injured reserve due to a torn triceps.

The Cowboys promoted defensive back Micah Pellerin from the practice squad to the active roster.

Waters also hyperextended his knee and injured his ribs against the Detroit Lions.

Mackenzy Bernadeau will start in his place.

Waters' loss is significant. He's a six-time Pro Bowl selection who was playing extremely well.

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Aaron Wilson covers the Ravens for The Baltimore Sun