The Reds secured their fourth consecutive victory in all competitions. Mac Allister scored alongside Hugo Ekitike, Virgil van Dijk, and Cody Gakpo, while an own goal from Axel Disasi sealed the emphatic win late on.
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"We could have scored more, maybe they had some chances as well,” Mac Allister told BBC Sport.
"But today I prefer to be positive and see the fact that we scored five goals, which is really good.
"We know that we need to improve a couple of things, especially defensively because sometimes the gaps are too big for us, but it is what it is.
"The good thing is that we won. The gap is now smaller with Aston Villa or the teams on top. We are happy with the result and we need to keep improving."