Sunderland have confirmed the signing of France Under-21 midfielder Alfred N'Diaye for an undisclosed fee.
The 22-year-old has signed from Turkish club Bursaspor on a three-and-a-half year contract. The Black Cats say he will wear the number 4 shirt.
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Kader Mangane has joined Sunderland on loan until the end of the season
Sunderland boss Martin O'Neill has spoken about the club's newest recruit - Alfred N'Diaye