Sadiq has scored 12 goals and provided 12 assists in 23 appearances for Serbian Super Liga siSerie de Partizan Belgrade this season.
According to a report in Turkish news outlet, Bilic, Partizan Belgrade recently turned down a €10m bid from a Qatari club for Sadiq.
Besiktas will have to cough out around €15m to land the tall striker.
The 23-year-old initially joined Partizan on loan from Serie A club AS Roma in July 2019, before the deal was made permanent in January, 2020.
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