The Leverkusen midfielder spoke of his regret at missing a penalty, while coach Sami Hyypia insisted his team will be back in the Champions League next year.
Bayer Leverkusen midfielder Simon Rolfes believes his team can be proud of its performance against PSG on Wednesday.
Leverkusen took the lead on the night through Sidney Sam, but Rolfes missed a penalty after Marquinhos had leveled, leaving Ezequiel Lavezzi to seal a 2-1 (6-1 Agg) win for les Parisiens.
However, the 32-year-old feels the tie with was a good test for his team and insisted the performance was an improvement on the 4-0 hammering it received on home soil in the first leg.
"We had a good character test," he told Sky Sport Germany. "We could have gone in front, but unfortunately I missed the penalty. We did better today and we were compact.
"We wanted to earn something for our good performance, but that's football. Today we played with more aggression, we should take this to the Bundesliga to be successful again."
Leverkusen coach Sami Hyypia said he noticed a considerable improvement in his side from its first-leg display in the BayArena and is confident his team will be back in the competition next season.
"We played well and showed character," the former Liverpool player reflected. "We were better in defense and played fast with the ball.
"PSG only had chances because our mistakes. If we could reduce them, everything would have been fine.
"We had everything in our own hands. If we do our job right, we will play in Europe again next season."
Leverkusen goalkeeper Bernd Leno says Wednesday's display was his side's best of the year so far and the 22-year-old believes the defeat will only help him to develop as a player.
"For me personally its perfect to collect some experience, also the bad ones. It was our best game in 2014, but we still have to improve and focus on Bundesliga.
"We have to be satisfied to reach the last 16. But we should also learn from our bad performances. We want to reach the Champions League again."