Dublin - Brazil goalkeeper Alisson kept a clean sheet on Saturday on his Liverpool debut in a 5-0 demolition of Carlo Ancelotti's Napoli in Dublin.
James Milner and Georginio Wijnaldum both scored inside the opening 10 minutes at the Aviva Stadium in Liverpool's penultimate pre-season friendly.
Liverpool lost Milner to a clash of heads with Napoli defender Mario Rui early in the second-half in an incident that left the former England international needing 15 stitches.
Mohamed Salah, who hit 32 Premier League goals last term - a record for a 38-game season, added a third for Jurgen Klopp's men just before the hour.
Daniel Sturridge and Alberto Moreno rounded out the scoring as Alisson, who joined from Roma in a deal worth up to £67 million last month, was relatively untested.
Liverpool conclude their pre-season at home to Torino on Tuesday before launching their Premier League campaign on August 12 against West Ham.