Robinson says he's coming back to Seattle

RENTON, Wash. (AP) Free agent fullback Michael Robinson says on Twitter on Thursday night that he's returning to the Seattle Seahawks.

The team said an agreement with Robinson, who spent the last two seasons in Seattle, was not yet official.

Robinson was a Pro Bowl alternate last season as the blocker in front of running back Marshawn Lynch. Robinson was also a captain and versatile on special teams for the Seahawks.

With Robinson's expected return, the Seahawks have already brought back five of their own key free agents: Lynch, defensive end Red Bryant, offensive linemen Paul McQuistan and Breno Giacomini, and special teams standout Heath Farwell.

Updated March 16, 2012