April 2014, the clash was tipped to be the title deciding game as the Reds headed into the clash on top of the Premier League table with City right behind in third position - with a number of games in hand. Klopp, then on a sabbatical, got that call from Liverpool. It's an odd situation, but hardly unique.
If anyone is to finally beat City in the Premier League this year, Liverpool have perhaps the best chance of doing it due to their excellent head-to-head history against Pep Guardiola's men.
"Everyone is vying for second place, but I think personally that by bringing in Van Dijk, you pretty much have cemented the top four with that one signing", he said. They may now be playing like supermen, but for many years it's as though Liverpool's ground was made of kryptonite for them. Meanwhile, Gabriel Jesus, Benjamin Mendy and Phil Foden are certainties to miss out on the trip to Anfield. If anything, their record's worse.
City overcame fellow Premier League side Burnley 4-1 whilst the Reds were victorious over rivals Everton. It's an astonishing record.
They lost there last season with Guardiola in charge, a 1-0 defeat to a goal from Gigi Wijnaldum.
"But Liverpool is such an important game", Guardiola added.
The German will be hoping that none of his other big name players will be thinking about leaving Merseyside anytime soon, with Mo Salah linked with Real Madrid recently. But this could be a tricky matchup for the Citizens since key midfielder Kevin de Bruyne will likely to be marked by the physical Emre Can. I would have liked to see that game without Mane getting sent off because Liverpool were well in the game before that and it would have been interesting. Knowing just who to buy would still be the thorniest issue.
Salah feels very confident when playing at Anfield as the fans' support is fantastic. "You have to move on though and Liverpool will always be Liverpool".
Who should Man City sign?
Virgil Van Dijk: The pressure of being the most expensive defender in history did not affect the Dutch centre-back at all as he stepped up to score the victor against Everton in his debut in the FA Cup. Holding a defence together against the best team in England is quite another. Perhaps Anfield was working its malevolent magic that day, too?
The club have decided that they'd be willing to sell him, even to another Premier League side, and have named their price at £30 million for the 28 year old.
"They stay focused until the last minute because they know they can make a goal". That doesn't bode well for the home side.
Here is everything you need to know ahead of the encounter on Sunday. It's business as usual. Something's got to give.