Antonio Rudiger is out of contract next summer.
The Blues are reportedly in talks with the German defender for a new deal whose contract expires in the summer of 2022.
Chelsea are keen to extend his current deal and has also been linked with a host of European clubs such as Paris Saint-Germain, Real Madrid and Bayern Munich.
Bayern boss Julian Nagelsmann praised the German defender who made an amazing development since the arrival of Thomas Tuchel at Stamford Bridge.
He said: “I’m generally not a big fan of talking about players who are under contract elsewhere, and besides, we’re outside the transfer period.
“I’m talking about him now as a football fan because he is a German senior international. He has made a super development. Thomas [Tuchel] has handled him extremely well – he was still on the sidelines at Chelsea a year ago and is now certainly one of their most decisive players.
“He has incredibly good aggression and is a very good defender. I haven’t spoken to Brazzo (Hasan Salihamidzic) about it and if I did, I wouldn’t tell you either!
“I just read that in the media as well. I’ll have to see when the contract expires and then I’ll see if I still have money in my wallet!”
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