Hasselbeck warmed up on the field for about 20 minutes approximately two hours before kickoff. He threw a number of passes downfield before jogging back to the locker room while Whitehurst remained on the field throwing.
"If we need him we're going to call on him," Carroll said of Hasselbeck
Receiver Brandon Stokley (head) was the only injury-related inactive for Seattle. St. Louis had no players inactive who were listed on Friday's injury report.
The Associated Press contributed to this report.