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The team announced that they have added two defenders to the squad - Titus Bramble, who has experience in playing matches, and Marcos Angeleri, who represented "Estudiantes".
The transfer fee for 29-year-old Bramble is not disclosed. Sunderland's coach Steve Bruce has been interested in this player for a long time, as he coached him at Wigan.
27-year-old Argentinean Angeleri, who signed a three-year contract with Sunderland, also remains a mystery in terms of the transfer fee.