Sunderland midfielder Kieran Richardson is set for another three weeks on the sidelines after suffering a hamstring injury in training.The former Manchester United man missed the defeat to Tottenham on Saturday after picking up the knock ahead of the game. It is a new blow for the 23-year-old, who scored three goals in five games following his return from a back injury in December.

Black Cats boss Roy Keane told the club's official website: "Kieran will be out for about three weeks, he has damaged his hamstring but that's life and you have to get on with the challenge."

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