Penny (calf) has been ruled out for Sunday's game at Seattle, John Boyle of the Seahawks' official site reports.
Penny has been hindered by a left calf injury all season, containing him to one appearance Week 1. Since then, he's been sidelined and will miss a third consecutive contest this weekend. Chris Carson is Seattle's unquestioned lead back, and with Penny out Travis Homer and Alex Collins again will handle any RB reps that linger.