Lamine Kone is a wanted man, with four Premier League clubs reported to be keeping tabs on the central defender.
Reports over the weekend said Everton, West Ham, Chelsea and Manchester United are weighing up a move for the Ivory Coast international, despite Sunderland's poor start to the season.
The Black Cats are bottom of the Premier League, seven points adrift of safety, after going 10 games without a win. They have just two points to their name.
It is the worst start in the club's history and in the history of the Premier League, with Arsenal adding to the misery with a 4-1 win on Saturday lunchtime at the Stadium of Light.
Kone struggled against the Gunners in a poor Sunderland display.
The Ivory Coast international was, though, a key figure in last season’s survival after arriving in a £5million deal from Lorient in January.
Everton lodged an £18million offer this summer, which then led to a statement being put out in Kone’s name claiming he wanted a move after Sunderland had failed to offer him a promised new deal – a claim rejected by the club.
Sunderland held onto him and he eventually agreed a new and improved contract to remain with the Black Cats until 2021.
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Meanwhile, Sunderland are reported to be among six clubs that have scouted 25-year-old forward Moussa Marega.
Stoke City, Watford, Crystal Palace, Leicester City and Tottenham Hotspur are all keeping tabs on the forward, who is currently playing for Vitoria Guimaraes.
On loan from Portugese giants Porto, he has scored 10 goals in eight appearances so far this season.