Reports suggest Black Cats manager Dick Advocaat is a huge fan of the Belgian midfielder and is still keen to sign him even though Spurs value the player at £15million.
Dembele started just 10 Premier League matches for Mauricio Pochettino last season and is believed to be unassured regarding his future at White Hart Lane despite starting in the weekend's season opener at Manchester United.
Sunderland have already snapped up Younes Kabul from North London this summer and varying reports are indicating that the Wearside club are set to go after Dembele as they look to add creativity and flair to their midfield.
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