He began his professional career with the
Green Bay Packers, where he backed up
Brett Favre, making his debut in
1999. He joined the Seahawks on
March 2, 2001, when the Packers traded him along with their first (17th overall) and seventh-round draft picks to the Seahawks for their first (10th overall) and third-round draft picks. In 2005, Hasselbeck had one of his most productive career performances, earning the highest
passer rating in the
NFC, and leading the Seahawks to the playoffs for the third consecutive year. He led his team to
Super Bowl XL, and was the starting quarterback for the NFC in the
2006 Pro Bowl.
Hasselbeck led the Seahawks to a 4-1 record to start the 2006 season before being seriously injured on Week 7. Minnesota Viking Linebacker
E.J. Henderson rolled into Hasselbeck's right leg. The result was a second degree
MCL sprain, causing Hasselbeck to miss four games. Hasselbeck contends that Henderson could have avoided injuring him.
http://www.startribune.com/510/story/762043.html Upon returning he subsequently broke several fingers on his non-throwing hand, but continued to lead his team to the Divisional Round of the postseason.