Seattle announced the signing Wednesday and said Trufant was expected to announce his intentions during a news conference Thursday.
Trufant spent nearly his entire NFL career with his hometown team. The native of Tacoma, Wash., and former star at Washington State was a first-round pick by the Seahawks in 2003. He went on to spend 10 seasons in Seattle, starting 125 of his 136 career games. He was voted to the Pro Bowl in 2007, but was slowed by injuries later in his career and went unsigned by Seattle after the 2012 season.
Trufant signed with Jacksonville before the 2013 season but was cut at the end of training camp.