Borussia Dortmund's CEO Hans-Joachim Watzke on Sunday accused Barcelona of manipulating Ousmane Dembele in a bid to force the German club to sell the want-away winger to the Spanish giants.
Dortmund suspended Dembele indefinitely a week ago when the 20-year-old boycotted training after the German club rejected an initial bid from Barcelona.
Watzke has accused the Spanish giants of influencing the France international to force Borussia's hand.
Barcelona want to sign Dembele and Liverpool's Philippe Coutinho to replace Neymar, who left for Paris Saint-Germain, but Dembele has a contract until 2021 with Dortmund.
Reports claim the Germans want 130 million euros ($152m) for the player they paid Rennes 15m euros for last year.
Dortmund have made it clear they will only sell Dembele if their price is met and Watzke is less than impressed with the role Barcelona are playing in the transfer saga.
"You have to talk about the role of the 'glorious' club Barcelona," Watzke told Sky.
"We met with their representatives, which commanded the respect, which I still had back then a few weeks ago, of such a big and serious club.
"In doing so, we found out that our ideas (over the price) are very far apart and therefore such a big gap could not be crossed.
"Then completely out of the blue, he didn't come to training.
"Do you honestly believe that a 20-year-old, without the benvolence of a new club, says 'I'm not coming to training'.
"Ousmane wouldn't have done that for any other club in the world -- we know that now."
Watzke says the chance of Dembele leaving is less than '50 percent' and if he stays, the winger will have to apologise to the Dortmund squad, some of whom have been highly critical of the Frenchman.
Dembele has already packed up his house in Dortmund and moved back to France.
"Ousmane isn't dancing around us, he is simply refusing to work," said the 58-year-old Watzke.
"That is obviously something new, he has gone on strike and has been suspended.
"There are now two possibilities.
"Either Barcelona pay the sum we have imagined and, if they meet our demands promptly, the transfer will go ahead.
"We will not negotiate.
"And if they don't pay, then he will be back as of September 1st and I am sure he will really want to play then.
"However, if that happens, he will really have to apologise to the club and the team.
"The fact the team is distancing itself from his behaviour is normal."
Dembele sat out Dortmund's 3-0 thumping of Wolfsburg on Saturday when US international Christian Pulisic, 18, took his place on the right wing and promptly scored and set up a goal in an impressive display.