Chelsea are close to an agreement for Aymen Abdennour on a season-long loan deal from Valencia, Goal understands.
The Blues will include an option to buy the 27-year-old in the contract after missing out on him last season, when he moved to Spain from Monaco.
Meanwhile, the Liga outfit plan to replace the Tunisia international with Manchester City's Eliaquim Mangala.
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The Frenchman is currently in Valencia discussing terms, and all three clubs are eager for a positive outcome.
Chelsea are also in talks to sign both Fiorentina's Marcos Alonso and Paris Saint-Germain's David Luiz after missing out on Napoli's Kalidou Koulibaly and AC Milan's Alessio Romagnoli this summer.