Barcelona boss Ernesto Valverde ruled out selling Dembele in May, claiming he was a key part of his plans.
He said: “We have to realise he just got here.
“He’s had some injuries and getting playing time in our team is not easy.
“He’s an incredible talent, technically outstanding, he’s quick, a difference-maker.
“Maybe he needs to work on defence a little bit and some other areas. Maybe putting on pressure after we lose the ball.