Chelsea could sign Bayern Munich defender Niklas Sule on a free transfer next summer.
The German was linked with the Blues during the summer transfer window, but Bayern had no plans of selling him.
He has yet to sign a new contract beyond next summer, and could sign a pre-contract with an overseas club in January.
Blues boss Thomas Tuchel is a huge admirer of the centre-back. He previously attempted to sign him for Borussia Dortmund.
He is eager to work with his compatriot in the future. The Blues are likely to make an approach for his services at the turn of the year.
Silva’s contract expires at the end of the season. It is uncertain whether the club have plans of keeping him for another campaign at 37.
Meanwhile, Rudiger has declined to extend his stay amid wage differences.