Carroll told KIRO-710 in Seattle that Thurmond is suffering from a hamstring injury, is "not doing well," and is "doubtful" for Sunday's game.
Thurmond has appeared in only two games this season, recording three tackles in wins against the Chicago Bears and the Arizona Cardinals on Dec. 2 and Dec. 9. In October of 2011, Thurmond suffered a cracked fibula after colliding with Earl Thomas, an injury that ended his season.
Thurmond, 25, is a third-year player who played collegiately at Oregon. As a rookie, he played 14 games and recorded 37 tackles. The 5'11" cornerback played in six games last season before the fibula injury, and has totaled 52 tackles in his career.
With three games left in the regular season, the Seahawks are 8-5 and currently holding on to one of the NFC's wild card spots for the playoffs.