Pass-rusher Jared Allen has agreed to sign with the Seattle Seahawks and is in the process of finalizing negotiations on a contract with the Super Bowl champions, according to league sources.

Barring unforeseen developments, Allen intends to sign an agreement as soon as Thursday while completing his second visit with coach Pete Carroll and the team.

In all likelihood the Seahawks had to convince Allen to accept being a prominent situational player in Seattle's defensive line rotation, one that was pivotal to the Seahawks dominating Peyton Manning and the Denver Broncos in their recent Super Bowl victory.

The Seahawks led the NFL in fewest points and yards allowed, and created the most turnovers in the league -- a feat previoiusly accomplished by the 1985 Chicago Bears.

Allen has 128.5 career sacks, ranking him 12th in NFL history. He has seven consecutive double-digit sack seasons, including 11.5 last season for the Minnesota Vikings but his contract is likely for significantly less than DeMarcus Ware and Julius Peppers got for changing teams in free agency.

The Broncos signed Ware for three years, $30 million with $20 million guaranteed. Peppers accepted a three-year deal totaling $30 million maximum, $7.5 million of which is guaranteed.