Dorsett never shined with Tom Brady in New England, catching just 73 passes for 881 yards and eight touchdowns in 45 regular-season games, including eight starts.
In Seattle, the 27-year-old adds more speed to an already fast wideout corps behind starters Tyler Lockett and DK Metcalf. Dorsett brings a veteran presence to the battle for No. 3 duties with David Moore, Malik Turner and John Ursua. The Seahawks could still be in line to select a rookie wideout in what could be a historically deep draft at the position this year.