The right-back returned to Reds training earlier this week after representing England at the World Cup this summer.
He was named on the substitutes’ bench for the friendly against the Serie A side and Jürgen Klopp confirmed ahead of kick-off that Alexander-Arnold is likely to feature at some point.
Asked about his team selection, the manager told Liverpoolfc.com: “Naby didn’t play two or three games, Gini didn’t play a lot of games – so they start today.
“Yesterday, Ragnar Klavan had a little – but enough – muscle thing, he cannot play. So Trent will have his first minutes today as well, not from the start.