Having clinched the signing of Conor Gallagher in August, Atletico are now chasing his former Blues teammate Enzo Fernandez.
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Atletico plan to make an offer in January of a six-month loan with a permanent option included.
And Okdiario says Chelsea are receptive to the approach - as is the Argentina international.
With Enzo no first-choice for manager Enzo Maresca, Chelsea are prepared to listen to offers for the midfielder.
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