It could be a yellow card.
Moments later, PSG threatened again when Neymar found Mbappe down the left and his low ball in was a whisker away from the waiting Cavani.
FW Eric Maxim Choupo-Moting, 6 - A surprisingly astute introduction from Tuchel in place of Cavani, he was an ideal battering ram and makeshift defender as the clock ticked down.
Whether it be with his heading, blocking or tackles, the centre back was on hand to snuff out any potential threat from the visitors, with his efforts at the back pivotal in PSG securing a crucial win. But in the Parc des Princes, he showed precisely why he is so important to Thomas Tuchel's team, with an outstanding performance that saw him control the game for the home side.
"I know it will be the headline", Klopp said, "but the number of interruptions in the game was not cool".
Theri predicted XI is as follows: Alisson; Alexander-Arnold, Lovren, Van Dijk, Robertson; Henderson, Wijnaldum, Milner; Mane, Salah, Firmino.
Substitutes: Keita (5), Sturridge (5), Shaqiri (5).
He also booked six Liverpool players compared with two from PSG.
DF Presnel Kimpembe, 6 - Struggled in the first half but found his feet in the second and grew into the encounter as it became more physical and tense.
"You don't have to do fouls if you're one goal down and you do 10 fouls in five minutes".
Liverpool will have to wait until the final day to see if they will make the last-16 of the Champions League.