Unger missed his sixth straight game as he continues to recover from a high ankle sprain. Unger practiced this week and was questionable on the injury report, but Seattle decided to hold him out at least until the playoffs.
Helfet suffered a rib injury last week against Arizona, while Simon suffered a shoulder injury. Helfet being inactive leaves Seattle with only two healthy tight eds.
Wide receiver Jermaine Kearse had already been ruled out with a hamstring injury.
AP NFL website: www.pro32.ap.org and www.twitter.com/AP-NFL