It is like all the news sources started making this news that Real Madrid are getting closer to reach an agreement with Antonio Rüdiger on a free transfer. The Guardian also says the same thing. It believes that we will see Rüdiger at Real Madrid next summer but I'm still having my doubts. As long as Rüdiger is happy at Chelsea, he would extend his contract. But of course, there is also a question mark about why he still hasn't extended it.

https://www.theguardian.com/football/2021/dec/13/real-madrid-hold-talks-with-chelseas-antonio-rudiger-over-summer-move