According to a report from the Detroit Free Press, the Seahawks traded for Polumbus but it is unknown what the Seahawks gave up in return.
Polumbus was recently released by the Denver Broncos, where he played for offensive coordinator Jeremy Bates in 2008.
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The Seahawks tried to claim Polumbus off waivers, but the Lions were higher on the list because of a worse record in 2009.
At 6-8, 320 pounds, Polumbus is a big body who gives Seattle more depth at offensive tackle, where injuries to Russell Okung (ankle) and Ray Willis (knee) have thinned the position.