Chelsea have spent extensive time scouting France international Jonathan Clauss.
The Blues are keen admirers of the 29-year-old Lens star, who plays as a right wing back.
Manager Thomas Tuchel wants to add Clauss to his squad.
If Chelsea were to secure Clauss, he would cost around £10 million.
The club sees him as able competition for first choice right-back Reece James.
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