Mangane left French side Rennes last summer to join Saudi Arabian outfit Al Hilal, after being linked with a number of Premier League sides.
While it is thought Al-Hilal initially rejected the bid, the size of which is unknown, it has now been confirmed Mangane will be joining Martin O'Neill's side.
Mangane has reportedly agreed to a six-month deal with the Black Cats.
Al Hilal president Prince Abdulrahman previously revealed they had received a bid from Sunderland, he said: "We received the official bid from Sunderland for Mangane."
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