Thomas Tuchel has identified Real Madrid defender Eder Militao as a potential target who would be suitable to his tactics, according to reports.
Chelsea have built their success so far under Tuchel on a solid defence, usually based from a back three.
But the identities of the players fitting in that system could be changing. Antonio Rudiger, Andreas Christensen, Cesar Azplicueta and Thiago Silva are all out of contract in the summer.
There are particular concerns about Rudiger leaving the club, while it was already clear that Silva would not be a long-term solution despite his impressive ability.
The Brazilian joined Real Madrid in a €50m transfer from Porto in 2019.
He has had to be patient for opportunities, but the summer departures of Sergio Ramos and Raphael Varane have opened up more space for him.
Militao remains under contract with Madrid until 2025.
However, since he is still on the same terms he agreed to when joining the club – one of the lower salaries in the squad – there is a feeling that he deserves a better offer