Liverpool will meet La Dea tomorrow night in Italy.
"They are an amazing team," Alexander-Arnold told a press conference. "We saw that last year. It's hard to pick one or two players out, but they are an amazing attacking force. We have to analyse their full team.
"It is a real team, is the best compliment I can pay to them. They have the right mentality, right way of going about things. The fact they were best attacking side in Serie A last season we need to look at.
"Italian teams are really good defensively and well organised and hard to break down. For us it's about finding a way to do that. I don't think it's against Italian teams we specifically struggle - and it's first time we are facing Atalanta."