Thompson was elevated from the practice squad ahead of Monday's game against the Giants, John Boyle of the Seahawks' official site reports.
Thompson started the season on the team's 53-man roster, appearing in each of their first three games, before being waived Wednesday. The 27-year-old then re-joined the Seahawks via their practice squad Friday and now finds himself back with the active roster. The Toledo product has only played on 10 snaps from scrimmage thus far and has yet to generate any stats.