Michael Zorc the Sporting director of Dortmund says they will only sell the French youngster if Barcelona ready to give the asking price for him.
Right now the French youngster is missing an internal suspension after the missing out the training,
This season Barcelona make Dembele their one of their main targets alongside him Barcelona is also eager to bring Coutinho from Liverpool after Neymar left them and joined the French capital side PSG for a World record fee.
Zorc made it clear that if Barcelona did not meet the asking price for the 20-year-old Youngster they will not sell him to them.
Zorc in an interview said: "We know where he is and have contact with him and his agent through a staff member,"
"We have a clear idea [of the fee] which Barcelona and the player know. If our demand is fulfilled, he will be transferred this summer. We will not make this transfer on the 30th or 31st of August."
Last season the French youngster Dembele joined the Dortmund side from Rennes for £13m, and after that last season, he has scored 10 goals for them in his 49 appearances in all competition.