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Liverpool have beaten Manchester City home and away this season, and overcome Real Madrid in the Champions League, but Jamie Carragher believes the September victory over AC Milan was their most important of the season.
Arne Slot's team sit 13 points clear at the top of the Premier League table after Wednesday's fixtures.
The Reds beat Newcastle United at Anfield, with Arsenal only able to draw 0-0 at Nottingham Forest earlier in the day.
Forest are the only team to have beaten Liverpool in the Premier League this season, winning 1-0 at Anfield in September.
The Milan game came three days later, and a second straight defeat could have tripped up the manager before he properly got going.
Liverpool fell behind inside five minutes in that game, with Christian Pulisic finding the net.
"I was thinking, you just mentioned the Forest game, and the Forest game came really early in the season," Carragher said on the Stick to Football podcast, brought to you by Sky Bet.
"If you lose at home to Forest and then at Milan, the first game in the Champions League, you lose away - that was probably a massive turning point, that AC Milan game?
"But if you can play so good it is - I won't say a disgrace - unbelievable you lose to Forest at home if you can play like this today."
After conceding to Pulisic, Liverpool went five straight matches without conceding a single goal in the Champions League.
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