Ahead of tomorrow night's clash at Porto, Agger said: "It was a big experience playing in a Champions League final and everyone is ready to repeat this.
"To be so close to winning it last season was hard, and ever since then I've been trying to forget the game. I don't like to even think about it.
"You have to keep focus in football and keep working hard to improve and keep getting better, which I've always tried to do. I've also been determined to keep my feet on the ground. At a club like Liverpool there's always pressure and you must learn quickly to cope with that.
"I don't know much about Porto, but I've seen them play a lot. I watched their games in Rotterdam during pre-season and we know they are strong with quality players. We will be prepared as we always are."
Liverpool have still conceded just one league goal - a penalty - in their first five games, and Agger hopes to take this form into Europe.
We're very proud of our defensive record so far, although conceding three penalties in five games is a lot and in each case it's been strange," he told the Liverpool Echo. "It's difficult to say whether we won a point or lost two on Saturday. Portsmouth are a strong team, especially at home, but we kept another clean sheet which is important to us, but we didn't create big chances during the game."