Reilly was a record-setting passer at Central Washington before signing in April 2009 as a rookie free agent with Pittsburgh. He also spent time last year with Green Bay.
He began his college career at Washington State before transferring to Division II CWU in Ellensburg.
In four seasons for the Wildcats, Reilly set virtually every school passing record. He holds the NCAA all-divisions record with at least one touchdown pass in all 46 career games.
Seattle also signed cornerback Marcus Udell and wide receivers Chris Duvalt and Victor James. All had free-agent tryouts at last weekend’s minicamp.