5 clubs Barcelona have angered with their transfer negotiations this summer

4) Borussia Dortmund

Barcelona are looking to sign Ousmane Dembele from Borussia Dortmund

With Neymar gone to PSG, Barcelona set about attempting to sign his replacement. And they had identified Borussia Dortmund starlet Ousmane Dembele as the perfect man to fill in the Brazilian's shoes (if at all that were possible).

The young Frenchman could play on either flank and had 8 goals and 18 assists in the Bundesliga and Champions League in 2016/17.

The interest became concrete when Barcelona general manager Pep Segura claimed that the club were close to signing both Philippe Coutinho and Dembele. Segura made this sensational claim soon after Real Madrid convincingly beat Barcelona to lift the Spanish Super Cup.

It led to Dortmund CEO Hans-Joachim Watzke giving his counterpart a piece of his mind.

"I don't know why he said that. Barcelona is not one step closer to signing Dembele. I cannot explain what he is telling me. Maybe it's because Real played his team dizzy in the Super Cup.

"Nothing has advanced, not even by a millimetre." - Watzke

However, there was more to this than met the eye. All of a sudden, Dembele did not report to training in an apparent attempt to force through a move.

Barcelona's offer of €100m was rejected earlier this month with the club now holding out for at least €140m. Sky have also revealed that the club rejected another €130m offer for the forward who turned 20 just three months ago.

But the manner in which they have unsettled a crucial player so close to the end of the transfer window and after the season has got underway will certainly irk the Bundesliga club.