However, the visitors were handed a lifeline through right-back Meunier, rather than one of their famed front three, as the Belgian skilfully readjusted to volley home Robertson’s miscued clearance.
Klopp was annoyed at his side for having to survive a nervous finale in winning at Tottenham on Saturday after passing up a series of chances to put the game to bed.
And it was looked like this time they would pay as Salah had a goal ruled out for a foul by Sturridge before the latter headed a glorious chance into the arms of Areola.
Salah has struggled to match his stunning 44-goal form of last season in recent weeks and was substituted by Klopp moments after gifting PSG a route back into the game.
His slack pass was intercepted and quickly fed into Neymar, with Van Dijk’s tackle on the Brazilian only rebounding into the path of Mbappe to fire home.
Liverpool instantly went in search of a winner as Trent Alexander-Arnold’s deflected free-kick came back off the woodwork, and finally got their reward when Firmino powered home.