Striker Darren Bent has stunned Sunderland by handing in a transfer request.
Press Association Sport understands the 26-year-old has asked to leave the club he joined for an initial £10million during the summer of 2009 amid speculation that Aston Villa have tabled an £18million bid.
A Sunderland statement on thier official website read: "The club can confirm that it received a written transfer request from Darren Bent following yesterday's Wear-Tyne derby match."
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