The Brazil international, who has been the subject of two failed bids from Barcelona, sent an email to Liverpool's Sporting Director Michael Edwards Friday lunchtime informing him of his wish to quit the club. It was immediately rejected.
Coutinho, for his part, had not wanted to take this drastic action either but now he feels he has no choice.
As far as he is concerned, though, a line has been drawn and a close family member explained that his relationship with manager Jurgen Klopp has fractured, saying that he "does not have the trust of his manager".
The family member added: "There are things that have happened, there is not the same bond. It is regretful, but that is the case. There is no going back."