5 clubs Barcelona have angered with their transfer negotiations this summer

3) Liverpool

Barcelona looked to lure Philippe Coutinho from Liverpool

Barcelona's pursuit of Coutinho actually started before they allowed Neymar to leave for PSG. With the idea of pairing two international teammates together, Barcelona thought they could appease Neymar while simultaneously improving their midfield.

But they were still serious about it even after Neymar left, with his transfer now becoming a necessity. They offered much more than they did for Luis Suarez three years ago but this is 2017 where money is no longer a factor for Premier League clubs.

Jurgen Klopp first came out and said: "We are not a selling club," and he was also backed by the board.

"The club’s definitive stance is that no offers for Philippe will be considered and he will remain a member of Liverpool Football Club when the summer window closes." - FSG statement

Well, that should have sent a message to Barcelona to back off, right?

Wrong! It only emboldened Barcelona to launch a larger bid. Their position was strengthened by the transfer request handed in by Coutinho.

Coutinho emailed transfer request to Liverpool sporting director, Michael Edwards, today having reported for training as normal.

— paul joyce (@_pauljoyce) August 11, 2017

Of course, transfer requests have no legal basis and the club flatly rejected it, stating that he was not for sale at any price.

Barcelona soon came back with a 'take it or leave it' £118m offer for the Brazilian, reportedly giving Liverpool a deadline. Nothing else was the subject of ridicule more than Barcelona's stance that weekend and they were soon resigned to not signing him as Liverpool stood their ground.