Vannett (ankle) has been ruled out of Sunday's game against the Dolphins, Curtis Crabtree of Sports Radio KJR reports.
Vannett was deemed out by coach Pete Carroll to begin this week, so this latest report confirms his inactive status for Week 1. With Jimmy Graham (knee) seemingly good to go following a full week of practice, Vannett's absence isn't as significant as it maybe otherwise would have been, but the rookie third-rounder will nonetheless be keen to make his regular season debut sooner than later.