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The call to arms has been delivered. Liverpool's 12th man won't let Jurgen Klopp down.

These are the nights when Anfield is rocked to its foundations. These are the nights of drama and nerve-jangling tension that Kopites live for.

Another chapter in the Reds' rich European history is about to be written.

The hope is that when the dust has settled on Tuesday night, Napoli's name sits alongside the likes of Saint-Etienne, Olympiakos and Chelsea.

The maths are clear. Win 1-0 or by two clear goals and the Reds' place in the knockout stages of the Champions League will be guaranteed.

If Paris Saint-Germain fail to win away to Red Star Belgrade then Liverpool will top Group C with any kind of victory over Carlo Ancelotti's side.

It really shouldn't have come to this. The draw for the Champions League did Klopp no favours with the French champions and the second best side in Serie A for company, but they have made painfully hard work of negotiating their passage to the last 16.

The all-important Champions League permutations

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A last-minute defeat in Naples, a wretched error-strewn display in Belgrade and a calamitous slow start in Paris. Liverpool lost all three away group games for the first time – failing to score a goal from open play.

Yet Anfield has remained a fortress. Wins over PSG and Red Star have ensured that the Reds remain in contention and their fate won't be decided until the final matchday.

There is so much at stake on Tuesday night.

Follow the latest build-up to Napoli HERE

Financially, the difference between marching into the knockout stages and crashing out is massive.

Liverpool's run to Kiev last May saw them pocket around £72million in prize money. Manchester United, who were beaten by Sevilla in the last 16, earned only half that figure.

How much Liverpool and Man Utd earned in last season's Champions League

This season the rewards are even greater after UEFA increased the prize pot by more than a third.

Each victory in the group stage gets you £2.36million (up from £1.35million last season) and reaching the last 16 is worth an extra £8.31m (up from £5.4m). That means £10.67million is up for grabs in the 90 minutes against Napoli just from UEFA alone.

If Liverpool fall short they will be hit in the pocket but what's on the line in terms of prestige is even more significant.

The importance of beating Napoli £2.36m Group stage victory £8.31m Reaching the last 16 £10.67million Win vs Napoli total worth

Klopp restored the Reds' reputation among Europe's elite last season. He made Liverpool a force to be reckoned with across the continent once again after a barren decade.

His European record since arriving at Anfield is highly impressive. He oversaw those memorable triumphs over Manchester United, Borussia Dortmund and Villarreal en route to the 2016 Europa League final in Basel.

Last term he took Kopites on a thrilling and unexpected journey to the Champions League final in Kiev. From the demolition of Porto to those unforgettable nights against Manchester City and Roma.

To follow that up by crashing out at the group stage would be a huge anti-climax and a bitter pill to swallow.

Some will argue that with Liverpool sitting top of the Premier League, failing in their mission against Napoli could be a blessing in disguise.

But that ignores the fact that Klopp strengthened his squad last summer to be able to deal with the twin demands of domestic and European challenges.

It also ignores the fact that barring a Red Star win over PSG, if Liverpool don't beat Napoli then they face the mother of all booby prizes – dropping into the Europa League.

That's the nightmare scenario. Finish third in Group C and the Reds will be playing Thursday night football in February.

The prospect of far-flung trips to Eastern Europe when Liverpool are bang in a Premier League title race isn't a pleasant thought.

No matter how they dress it up, the Europa League will always be the poor relation. It's far removed from the glitz, the glamour, the glory and the financial benefits of the Champions League.

It won't be straightforward against Napoli. Ancelotti rested a host of key men on Saturday as they hammered Frosinone 4-0. They are packed full of experience – they won't be like rabbits caught in the headlights.

Napoli, who are unbeaten in their past 12 matches, don't need to win. A point will do for them and they have already drawn in Belgrade and Paris.

Yet better teams than Napoli have been swept aside at Anfield over the course of 2018. It's about hitting them with a tempo and an intensity they aren't used to encountering.

The difference between success and failure is vast. There is no middle ground. It's all or nothing for Klopp's Liverpool.