Antonio Conte wants the right back as a long-term replacement to club veteran Branislav Ivanovic.
The Blues now want to bring him to Stamford Bridge in a £25million swoop, according to French newspaper L’Equipe
However, the Ligue 1 side are still hoping that Champions League football will see them keep their man.
With Kurt Zouma still injured and Baba Rahman having left on loan, Conte will be hoping to lure him over to the Bridge