Unfortunately we all know that the Champions League is a truly hard competition, just see the teams that have been eliminated, the thing that can tell himself the leverkusen is that in the end it managed to get to this point, if you see this thing you understand that it is one of the strongest teams in Europe, certainly among the top 16 and it is not bad as a result if one thinks well
With this awareness he can work to improve more, perhaps next year!
The competition is actually tougher than we think and people who have participated know what it takes to qualify for it and this is why the Champions League is one of the most respectable leagues we can ever mention and that is why if you are bagging it, it makes more sence.
One thing I love about Leverkusen is that no matter the circumstances they are always trying there best even in the Bundesliga they are having serious drag with bayern Munich so this is enough reasons you need to make more choices at always getting better.
And they are the defending champions of the Bundesliga, no one expected them to have gone this far and it's a good sign that they will go far.