Jackson, 32, has been Russell Wilson's back-up the last two seasons. He was the starting quarterback for the Seahawks in 2011 and is well respected by the players. Jackson played last year for $1.25 million, but was a free agent at the end of the year.
The Seahawks only other quarterback on the roster is R.J. Archer of William & Mary, but he never has played in an NFL game. B.J. Daniels, who was the team's third quarterback last year, has moved to wide receiver.