Chelsea risk allowing key defender Antonio Rudiger enter the final year of his contract amid growing uncertainty over his future.
The Germany international has become one of Tuchel's most integral players since the head coach's arrival in January, helping the club back into the top four with a host of excellent displays in the heart of Chelsea's defence.
Tuchel has overseen 12 games since his appointment, notching 10 clean sheets in the process - Rudiger has started in eight of those games.
In fact, from his 20 appearances for the Blues this season - Chelsea has amassed 15 clean sheets.