They can't get RB Leipzig's midfield maverick in soon enough.
Having left Liverpool, in the January transfer window, Coutinho never really got the chance to say goodbye to the Liverpool supporters who he charmed with his play.
But Quinn believes the investment boss Jurgen Klopp made in the 25-year-old forward has outstripped any other Reds signing in over a decade.
The duo spoke on a variety of issues ahead of the Champions League round of 16 tie. It makes Anfield a fortress, a seething cauldron from which few visiting sides emerge with fond memories.
Firmino said the exit last month of Coutinho, his close friend, forced he and his Liverpool teammates to step up and take on further responsibility.
Liverpool fans already know he is special but increasingly the wider media is catching on to just how good he is. This is where Keita comes in; the Guinea international is not so much a Coutinho replacement as he is a vital piece of the jigsaw, and possibly the final one.
Coutinho has played six times for Barca since his arrival, scoring one goal. It may prove to be particularly useful against fellow top sides and when Livepool are required to do that most un-Liverpool of things and protect a slender lead.
"He's a very important player and he doesn't always have to be the standout player".
Paulinho and Yerry Mina are the two non-EU players alongside Coutinho in the current quota.
Charlie Nicholas has revealed his admiration for Roberto Firmino after comparing the in-form forward to Barcelona striker Luis Suarez, believing he is "not far off" the Uruguayan's level. And that included a rebound.
'We qualified for the Champions League without Phil, he was not involved in either of the Hoffenheim games [that qualified Liverpool for the group stage].