Also on Friday, Sky Sports News received a statement said to be from a member of Coutinho's family.
Here, we look back at the key dates this summer in Barcelona's pursuit of the Reds star - with the Catalans twice being knocked back with big-money bids.
Both Klopp and the club's executives have continued to insist that the player is not for sale, with the German boss telling the Liverpool Echo that the process for a move did not start early enough.
"But the stuff about not getting on with Klopp, these stories getting fed out, that's where I think that crosses the line".
Confirmed reports claim the 25-year-old has emailed the club an official transfer request on Friday, with his eyes set on a Camp Nou switch.
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.
'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.
Coutinho signed a new five-year deal with the Merseyside club in January that did not include a buy-out clause.
"That's the way I feel but the way I see it panning out is that the club will try as much as they can to keep him". "All the rest is just between me and all the boys, not just Phil".
"I've said before there is not a problem with him wanting to go to Barcelona, 99 per cent of footballers all round the world will want to do that", the former defender added.