Cech was pleased with their 4-2 win at Valencia on Thursday night. They reach the final 7-3 on aggregate.
He said, "With all my experience, I can compensate for the match rhythm with my preparation. The key is always how you prepare in training and I always behave the same whether I am starting or on the bench. I always feel confident I am ready to play. I enjoyed it when we scored the fourth goal because that was the moment i knew we were in the final."
On his retirement decision, he added: "You have days when you play well and you think you could continue but I think I have made the decision with a lot of thought. I could possibly go another two years but I would rather retire early than too late. I wanted to do it on my terms. The last dream was to play this European final and it has come true, now the dream is to win it."