The 28-year-old central defender has signed a three-year deal at the Stadium of Light after travelling south for talks and a medical, and has admitted the chance to test himself in the Barclays Premier League proved too much for the Dons skipper to resist.
He said: "I am hugely excited. It´s a big club going places and it´s exciting times to be coming here, so I am certainly looking forward to the challenge ahead."
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