Whitehurst was the starter in last Sunday's 16-6 win over St. Louis to wrap up the NFC West title. Hasselbeck sat out that game with a hip strain suffered a week earlier against Tampa Bay.
Pitts started five games at left guard this season, but he was replaced for the regular-season finale by Tyler Polumbus. Baker started 13 games and caught nine passes.
Notes: Seattle placed RB Chris Henry on practice-squad injured reserve, released LB Vuna Tuihalamaka and signed RB running Andre Anderson and TE Nick Tow-Arnett to the practice squad.
Copyright 2011 by The Associated Press