Pili (back) has been ruled out to face Arizona on Sunday, John Boyle of the Seahawks' official site reports.
Pili has missed four games this season, including last Monday's loss to Chicago. He'll be sidelined again this Sunday, as he's dealing with a back injury. Pili's absence probably won't make huge waves in the Seahawks' defensive rotations, as he's logged just 19 defensive snaps through four contests.