Besiktas goalkeeper Ersin Destanoglu has reportedly been eyed up by Chelsea as further back-up for Edouard Mendy.
Chelsea will be without first-choice keeper Mendy for around a month from the end of December due to his Africa Cup of Nations commitments with Senegal.
The Blues have the world's most expensive keeper Kepa Arrizabalaga to fall back on, but it has been widely reported that Thomas Tuchel wants further cover between the sticks.
According to Turkish outlet Fotomac, Chelsea are particularly interested in Besiktas stopper Destanoglu, who already has 50 senior appearances to his name despite being aged just 20.
The report suggests that Chelsea chiefs have already opened talks with their Besiktas counterparts, with a bid of around €12m (£10.3m) now expected to be tabled.
Destanoglu has kept four clean sheets in nine Super Lig games for the Turkish giants this season.
