It is understood the player's representatives suggested privately he would be submitting the request at lunch time yesterday, and that duly followed, with the player himself sending an e-mail to the club setting out a formal transfer request.
Liverpool rejected a second Barcelona bid for the player worth €100 million (£90 million) on Thursday, per the Guardian's Andy Hunter, having had an earlier bid of £72 million also turned down by the Merseysiders.
Fenway Sports Group, which owns the club, released a statement shortly thereafter saying that no offers for Coutinho would be considered despite his request to leave. I didn't see the club insiders today. It was pretty clear what the club said about it. "And that is the way it will go".
Do you ever have any question about anything you wish to ask and get answer?
Sportsmail reports that the new developments have caused tension and angst between the player and the club.
"It's hard now as he doesn't want to be there - Liverpool is one of the biggest clubs in the world but he doesn't want to be there".
As the transfer saga continues, Coutinho will miss tonight's clash with Watford with a back problem. I can not buy a player just to have a player.
Atop their list of potential arrivals are the likes of Paulo Dybala, Ousmane Dembele, and of course, Liverpool star man Philippe Coutinho.
LIVERPOOL will rebuff any bids for Philippe Coutinho in this transfer window, the club's American owners said on Friday, in the latest blow to Barcelona in its attempts to replace Neymar.
These two faced each other a little over three months ago at the end of last season, with Liverpool coming away with a 1-0 win thanks to this memorable Emre Can goal.