The Chelsea boss wants to bring in a new striker and Aubameyang has been heavily linked with a move to the west London club.
Barcelona do not want to lose him, with Xavi Hernandez intent on keeping him, and the striker is not pushing to leave the Catalan giants.
But Chelsea are still keen and are weighing up the possibility of getting their hands on the forward.
And they have the support of Tuchel, who is claimed to be sure about getting the best out of the forward if he joins Chelsea.
The German coached Aubameyang at Borussia Dortmund and had a positive relationship with the Gabonese.
He is aware of what makes the Gabon international tick and is prepared to reunite with the forward Dortmund man.
For the moment, Aubameyang is not keen to leave but Barcelona are in a tricky financial position and could agree to cash in.
