Liverpool's hopes of reaching the Champions League last 16 are hanging by a thread following Wednesday night's 2-1 defeat to Paris Saint-Germain.
Victory for PSG meant they leapfrogged their opponents into second on eight points, one point behind Group C leaders Napoli and two ahead of Liverpool.
It means Liverpool must beat Napoli at Anfield in two weeks' time to progress - which is a tall order considering the Italians are unbeaten.
Jurgen Klopp knows there's a lot of work to be done between now and then, but he's called on Liverpool fans to create special atmosphere.
"Of course, I know that," said the German when asked if he's confident. "We need Anfield again, we need to create an atmosphere which is pretty special.
"But Napoli is a really strong side and they played well here, they played against us really well. We were not that good that night, but they played really good.
"But it's in 13 days, December 11, so we have a few other games before that. We have to make a special night of it, 100 per cent, if we want to go through."
Klopp made several changes to the side that beat Watford 3-0 last weekend as the German dropped Trent Alexander-Arnold for Joe Gomez and started James Milner.
Alongside Milner was captain Jordan Henderson and Georginio Wijnaldum, while Dejan Lovren started next to Virgil van Dijk at centre-back.
Mohamed Salah, Roberto Firmino and Sadio Mane were the attacking trident as usual.
So what went wrong for Liverpool? Well, the Sunday Times' Jonathan Northcroft claims the Reds had three problems at the Parc des Princes.
Northcroft believes Liverpool's midfield three lacked balance and that Klopp made a mistake by not sticking with Gomez and Van Dijk. He also thinks Firmino may have needed resting.
"Thought Liverpool had three problems last night," wrote Northcroft. "Selection: that midfield three lacks balance and why mess with Gomez + VVD axis in a big game?
"Firmino. Key to the attacking system yet off his best. Again. Does he need a rest?
"Re Firmino: has played 85 games since the start of 2017-18. He's super fit but maybe needs a rest mentally."
It's hard to argue with Northcroft and Liverpool fans think he's spot on, with some adding that one of Naby Keita or Fabinho should have started in midfield.