Penny injured his left calf during Sunday's game at Indianapolis.
Penny tended to a calf injury during Week 1 prep, logging limited showings Wednesday and Thursday before capping it with a full practice. But the injury resurfaced Sunday, which has been the story of his three-plus years in the league. Behind clear top back Chris Carson, the Seahawks have Travis Homer and DeeJay Dallas at the ready for backfield reps.