The pair were on Wearside on Wednesday afternoon to undergo medicals, which Finland international Tainio passed. The 28-year-old becomes Black Cats boss Roy Keane´s first summer signing and has signed a three-year contract.
Keane said on the club´s official website, www.safc.co.uk: "I´m delighted to sign a player of Teemu´s experience and quality, he´ll be a valuable addition to our squad."
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