LIVERPOOL, England — Trent Alexander-Arnold shuffles uneasily on his feet. He is standing in the assembly hall at St. Cuthbert’s, a Catholic primary school in Liverpool, a few minutes’ drive from the part of the city where he grew up. About 50 or so children sit on benches in front of him. Some beam with pleasure. Some whisper excitedly. Most just stare at him, as if he has descended from another planet.

This, certainly, is a new world for Alexander-Arnold. It is barely more than a year since he made his Premier League debut for Liverpool, his hometown team, and a few months since he scored his first goal. He is 19. He remembers what it was like to be one of those children, eagerly hoping for a visit from Steven Gerrard or Jamie Carragher, and he still finds the idea that he might now be anyone’s hero a little strange. “It still hasn’t caught on for me, really,” he said.

On a cold Friday morning in December, he is here on behalf of a local charity called An Hour for Others. The organization has prepared hampers, packed with food, to be handed out to some of the most underprivileged children at the school.