Chelsea boss Antonio Conte dropped out-of-favour striker Loic Remy for the second consecutive game going into the Watford clash.
The Blues ended up winning the game 2-1 but Remy was not included in the match day or provisional squad.
Chelsea XI to play Watford: Courtois, Ivanovic, Cahill, Terry, Azpilicueta, Kante, Matic, Pedro, Oscar, Hazard, Costa
Subs: Begovic, Aina, Loftus-Cheek, Fabregas, Chalobah, Moses, Batshuayi.
Conte does not appear to have plans for Remy this season and Besiktas are currently in talks with the Blues over loaning the French striker a source close to the club told Turkish-football.com.
The Sun meanwhile report that Crystal Palace also want the 29-year-old striker and that Remy wants to leave in pursuit of first team football.
Besiktas would be able to guarantee first team football as Remy would come in as a replacement for Mario Gomez who joined Wolfsburg.
The Black Eagles would also be able to offer the experienced striker Champions League football next season.