The Blues want a top striker and Erling Haaland is top of their wishlist at Borussia Dortmund.
The Bundesliga club are reluctant to sell, but Roman Abramovich could well help get any potential deal over the line this summer.
Chelsea, meanwhile, have a host of players fighting for their futures at Stamford Bridge.
Tuchel has plenty of decisions to make ahead of the 2021/22 campaign, and Daily Star Sport has all the latest gossip surrounding the club and their next moves in the transfer window.
Haaland bid incoming?
Chelsea owner Abramovich has reportedly given the ‘green light’ for a mega club-record bid to be lodged for Haaland.
Spanish newspaper AS say a £150m offer has been approved by the Russian billionaire.
The Blues would seriously test Dortmund’s resolve with an offer that substantial.
Haaland would become the second most expensive signing of all time behind Neymar if that deal went through.
Last chance saloon
Tuchel is willing to give Chelsea’s forgotten players a fresh start in pre-season and will make up his own mind on them all.
Ghanaian left-back Baba Rahman is among those in training, as are Charly Musonda, Matt Miazga and Ruben Loftus-Cheek.
Others at Cobham working with the German manager include Armando Broja, Malang Sarr, Davide Zappacosta, Danny Drinkwater, Conor Gallagher, Lewis Baker, Jake Clarke-Salter, Ian Maatsen, Trevoh Chalobah and Marc Guehi.
Medical on Friday
Olivier Giroud is set to complete his move to AC Milan from Chelsea on Friday.
The ex-Arsenal striker will undergo a medical with the Italian outfit at the end of the week.
And he is poised to sign a two-year contract at the San Siro.