Mike Garafolo of Fox Sports first reported the news that Wisniewski was visiting with the Seahawks.
Wisniewski (6-foot-3, 315 pounds) was a second-round draft pick out of Penn State by the Oakland Raiders in 2011. He was a four-year starter at center and left guard, the two spots where the Seahawks have needs.
But the Seahawks likely are looking at Wisniewski to come in and replace Unger at center.
Wisniewski uncle, Steve Wisniewski, played 13 seasons for the Raiders (1989-2011) and was an eight-time Pro Bowl selection as a guard. Stefen’s father, Leo, played four seasons for the Cleveland Browns as a nose tackle.
Wisniewski reportedly visited the Tampa Bay Buccaneers on Wednesday. He is believed to be seeking a deal with would pay him in excess of $3 million per season.