Liverpool won the semi-final first leg 5-2 against AS Roma at home and Klopp could lead them to their first Champions League final since 2007.
"He's a massive influence. You hear a lot of players saying a manager is like a father figure, and I think that's definitely the case with the manager here," Alexander-Arnold told Sky Sports. "He's really encouraging for young players...
"He understands the game unbelievably well... knows that mistakes will happen. But he knows it's how you react to them, and how you keep on going, how to play with the team's identity, no matter what the scoreline is, that we have to believe in our ability.
"The way we want to play is high-pressing, win the ball back as high as possible and play football, and that's obviously what we try to do, and he instils that no matter what the score is."
The Merseyside club have also progressed on the domestic front as Liverpool look to seal a top-four league finish for the second consecutive season. But Alexander-Arnold wants the team to aim higher.
"It's not just about coming in the top four and finishing fourth," Alexander-Arnold added. "It's about trying to get third and second, trying to do as well as we can to push on to that next season.
"It's important to push on at the end of a season to set you up for a season..."
Liverpool host Stoke City in the league on Saturday ahead of their Champions League trip to Rome next week.
(Reporting by Aditi Prakash in Bengaluru; editing by Sudipto Ganguly)
