Chelsea have instructed their intermediaries to bring them available defensive transfer opportunities.
BILD football chief Christian Falk is reporting Chelsea are targeting three centre-backs.
Thomas Tuchel is in the market to bolster his defence with Antonio Rudiger agreeing a deal to join Real Madrid.
Meanwhile Andreas Christensen is poised to link up with Barcelona when his contract expires at the end of the month.
Commenting on the Blues' targets, Falk tweeted: "Chelsea have on their list for new defenders.
"Presnel Kimpembe (PSG), Matthijs de Ligt (Juventus) and Jules Kounde (Sevilla)."
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