Chancellor suffered a season-ending neck injury during Seattle's 22-16 victory over the Arizona Cardinals on Nov. 9.
Seahawks safety Kam Chancellor is officially out for the remainder of the season with a neck injury, head coach Pete Carroll confirmed.
"He's not going to make it back this year," head coach Pete Carroll said Monday while appearing on 710 ESPN Seattle. "Beyond that, it's up to him."
Chancellor suffered a neck injury during Seattle's 22-16 victory over the Arizona Cardinals on Nov. 9 and has not played since. The four-time Pro-Bowler's physical style of play has led to many injuries throughout his career. Chancellor missed four games last season due to a groin injury and has not played a full 16-game schedule since 2013.
In nine games this season, Chancellor ranked third on the team with 48 tackles, but failed to record an interception.
Seattle lost cornerback Richard Sherman to a ruptured Achilles this month as well. Sherman is also out for the rest of the season after getting tangled with receiver John Brown in the third quarter.
Defensive end Cliff Avril is also out with a neck injury and he can't return until at least Week 14.
Sherman and Chancellor's injuries are a serious setback for a Seattle defense that ranks 12th in total defense in the league.