Quarterback Tarvaris Jackson re-signed with the Seattle Seahawks Tuesday, a deal that was agreed upon one week ago. Jackson, 32, returns for his fourth season in Seattle having originally signed in 2011, then re-signed in 2013 after spending one season with Buffalo.

Jackson started 14 games in his first season with Seattle, completing 271 of 450 attempts for 3,091 yards, 14 touchdowns, and 13 interceptions. Jackson played much of that season with a partially torn pectoral muscle, helping him build a lot of credibility in Seattle's locker room and making him a very popular signing when he came back in 2013. Jackson was part of the three-man quarterback competition in 2012, and after Russell Wilson won the job, Jackson was traded to the Bills. He returned to Seattle in 2013 and has served as Wilson's backup the past two years, the role he likely will have again in 2015.

A spot on the 90-man roster opened Monday when defensive end Ryan Robinson was waived/injured with an Achilles injury. Robinson, who had surgery Tuesday at the Seattle Surgery Center, cleared waivers Tuesday and is now on Seattle's injured reserve list. He does not count against the 90-man roster limit.