"Thomas Tuchel is my favourite manager," Dembele has told beIN Sports.
"With Thomas Tuchel, I played a bit more on the right side at the beginning of the season, and then I was moved more centrally, in the No.10 position, sometimes even in the midfield three. He told me to stay a bit more centrally and 'have an espresso' as he used to say to me. 'The ball will come to you and then you will go'.
"It would have been hard to leave Dortmund if Tuchel had stayed," the Frenchman concluded.
Dembele would've unlikely joined Barca if not for his big 2016/17 season at Borussia Dortmund. The forward scored 10 goals and provided about 20 assists for the Bundesliga side that term.