Brighton's Lewis Dunk
The Black Cats have endured a difficult summer in the transfer market, but new manager David Moyes has managed to bring in centre backs Papy Djilobodji and Paddy McNair from Chelsea and Manchester United.
Lamine Kone scores for Sunderland
There are still questions about the Sunderland back line though, with the club confirming on their official website that they have accepted an offer from Watford for Kaboul, whilst the Daily Mail claim that central defender Kone has snubbed a new contract in order to try and force a move to Everton.
If both leave, Moyes will once again be left short-staffed at the back, and the Daily Mail report that Sunderland have identified Brighton star Lewis Dunk as a possible solution.
Brighton's Lewis Dunk celebrates scoring their fourth goal
Dunk, 24, was born in Brighton and came up through the ranks with his hometown club, and has racked up more than 150 appearances for the Seagulls, becoming a key part of their defence in recent years.
At 6ft 4in tall, Dunk is a dominant centre-back with great aerial ability, and whilst Brighton are pushing for promotion to the Premier League, their defeat in the semi-finals of last seasons play-offs has raised questions about the long-term future of Dunk.
Lewis Dunk celebrates scoring the first goal for Brighton
It's now claimed that Brighton are poised to sign Blackburn centre-back Shane Duffy, freeing up Dunk to leave the club before this month's transfer deadline – and Sunderland are believed to be keen.
The report states that Sunderland have identified Dunk as a possible replacement for Kaboul once he goes, or Kone if he does indeed get his move to Everton, but it's unclear just how much Dunk would cost the Black Cats.
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