Besiktas have been linked with moves for Dnipro’s Boyko and Douglas Silva.
The Turkish daily sports paper Fanatik state that the Eagles have established contact with the Ukrainian club with the view to sign the two players during the January transfer window.
27-year-old goalkeeper and has three caps for the Ukrainian national side. Besiktas have been on a look-out for a new goalkeeper following a string of high profile errors from Tolga Zengin.
25-year-old Brazilian centre back who was also linked with a move to the Turkish Super Lig over the summer transfer window. Silva has made 21 appearances for Dnipro this season.
Fanatik go onto state that Besiktas are preparing a €6 million bid for the duo.
Besiktas travel to Ankara to take on Osmanlispor in the Turkish Super Lig this weekend. The Istanbul based club sit in first place with 35 points in 15 games.