The Brazilian was brought in from Roma this summer for a then world-record fee.
From eight Premier League matches, the Reds have kept five clean sheets. And Alexander-Arnold believes Liverpool’s defence has been helped by the addition of Alisson.
“The messages the manager gives us and the way we defend as a team is front footed,” he continued.
“We don’t want to concede too many chances and we haven’t so far this season, but when the ‘keeper has been called upon, Alisson has made some world-class saves and shown he is a world-class ‘keeper.”