The former Barca and Chelsea ace is keen to fill the void left by Mario Gomez with the Turkish champion, which is now trying to strike a deal with his current club Antalyaspor.
Besiktas has agreed to a deal in principle to sign Samuel Eto'o, Goal understands.
The Turkish champion is looking to sign a new striker after Mario Gomez, who scored 26 Super Lig goals last season while on loan from Fiorentina, opted against extending his stay at the Vodafone Arena.
Besiktas has since turned its attention to Eto'o and is now trying to thrash out a deal with the striker's current club Antalyaspor after reaching an agreement with the player.