Colgan, who was released by Ipswich this summer, is a surprise acquisition as Keane already has Craig Gordon, Darren Ward and Marton Fulop on his books.
But the 34-year-old has signed a one-year deal with Sunderland, who become Colgan´s 13th league club in England and Scotland following a move to Chelsea from Drogheda United in 1991.
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