The 29-year-old defender is not in Ange Postecoglou’s plans this term and the Tottenham boss wants to add another centre-back to his squad.
Dier has entered the final year of his contract with Spurs and he is open to an exit if the destination is right.
Premier League side Fulham are interested in acquiring his services, but they are not the only ones in the ongoing window.
Besiktas, who are in this season’s Europa Conference League, are also interested in him and believe that the 29-year-old experienced defender would strengthen their defence.
According to Turkish daily Fotomac, Besiktas have approached Tottenham and both clubs have started negotiations for Dier.
It is said that Fulham are exploring a swap deal with Spurs for Dier in exchange for Tottenham-linked star Tosin Adarabioyo.
With Tottenham interested in offloading the English international, it remains to be seen whether Besiktas will be able to come to an agreement for Dier.
