If all goes to plan, Obomanu will return for at least three more seasons with the team.
Seattle has announced a three-year extension for Obomanu, who scored four touchdowns and averaged 16.5 yards per catch this season.
The team recently signed fellow receiver Mike Williams to a three-year extension. Both players have taken advantage of opportunities after Seattle released T.J. Houshmandzadeh and traded another veteran wideout, Deion Branch.
Obomanu is one of several seventh-round success stories among Seattle draft choices. Tight end Cameron Morrah (2009) made a key 39-yard reception against New Orleans. Justin Forsett (2008) has played extensively at running back. Several others over the past decade -- Dennis Norman, Josh Brown, Donnie Jones, Steve Vallos and Courtney Greene -- remain active elsewhere despite their last-round status.