Turner moved to the Stadium of Light on transfer deadline day

The Premier League is to investigate the sale of Hull defender Michael Turner to Sunderland in August.

Two of Turner's former clubs Brentford and Charlton have allegedly lost big amounts in sell-on fees.

BBC Sport understands both clubs have lodged letters with the Football League while the Premier League has asked Hull and Sunderland for their comments.

At the time of the transfer the fee was undisclosed but Hull had previously reportedly valued Turner at £12m.

Turner was one of only two players to play every minute of all his side's Premier League games last season.

He joined Hull from Brentford for £350,000 in the summer of 2006, having signed for the Bees permanently from Charlton following a loan spell in December 2004.

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