Dembele seems to have rediscovered his form in the last few games and he believes that his coaches at Barcelona have helped him improve both fitness-wise and tactically.
"Physically I think I have changed," Dembele said. "When I arrived here, I was very fragile.
"I was starting as a professional at Stade Rennais and Borussia Dortmund, I was very fragile, but I have come a long way and I found fitness coaches here and everything changed.
"I received advice, when to attack, when to be calm with the ball.
"I liked to move forward only when I had the ball, and they told me to wait and try to find a teammate and not dribble three or four rivals."
"A lot of things have changed with [Koeman], especially regarding training and preparing for the matches," Dembele noted.
"Physically, we feel very good. The training is both about quality, and also high intensity.
"I think [Barcelona] are in top form. It's great that we are midway the season, we have objectives and we will do everything possible to win titles."