"A league source has confirmed that the Seattle Seahawks have agreed to terms with free-agent quarterbak Tarvaris Jackson, and that he is expected to sign with the team on Friday.

Dave Mahler of KJR 950 AM first reported the deal on Twitter, moments after multiple reports surfaced that veteran quarterback Matt Hasselbeck does not plan to re-sign with the Seahawks.

Unrestricted free agents cannot sign contracts with teams until Friday, but the negotiation period between teams and free agents began at 7 a.m. Pacific Time on Tuesday.

ESPN's John Clayton reported last week that the Seahawks were interested in Jackson, who spent the first five seasons of his career in Minnesota. During that time, the Vikings' offensive coordinator was Darrell Bevell, who was hired in January by Seahawks coach Pete Carroll to fill that same position in Seattle."