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The Black Cats are battling West Ham to land the Senegal international, who scored 16 goals for the Turkish side last season.

Sow has revealed his desire to play in the Premier League.

And after the arrival for Manchester United of striker Robin van Persie, Fenerbahce risk losing the 29-year-old African star for nothing if they allow him to run down his £30,000-a-week contract which has just 12 months to run.

Club president Aziz Yildrim is holding out for at least £14m for a player who cost £10m from French club Lille in 2012.

(Image: GETTY)

Dick Advocaat is keen to land Sow to strengthen his squad, and the Dutchman is refusing to panic despite Sunderland’s mounting problems in pre-season.

The Black Cats’ head coach has made four new summer additions, but is still at least two signings short of the minimum he stipulated when performing his u-turn to return to Wearside in June.

Sunderland’s performances and results in their warm-up games so far have dropped below the standards demanded by the 67-year-old.

Fans are worried after the 2-0 setback at League One Doncaster on Wednesday made it three defeats in five games ahead of Saturday’s final friendly against German side Hannover.

“The fitness has to be there but it was a poor result against Doncaster,” admitted Advocaat ahead of the Premier League opener at Leicester City.

“Hopefully on Saturday we can show how far we are with our progress against Hannover.”

Along with Sow, Advocaat also wants a reunion with Ola Toivonen, the Swedish midfielder he worked with at PSV Eindhoven.