Sunderland have signed defender Phil Bardsley from Manchester United on a three-and-a-half-year contract.

The right-back, who had a loan spell at Sheffield United earlier this season, has joined in a deal worth up to £2million.

Sunderland boss Roy Keane said: "We needed to strengthen our defence and Phil is a good addition to the squad."

Bardsley added on the club's website: "Sunderland have a fantastic manager who has given me the chance to come here and play.

"I'm delighted, it's a massive club and a good opportunity."

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