And the Pole called Klopp the best manager he has ever worked under.
"[Klopp] has two faces. You can see that he is kind of like a father, but the second part is like a coach, a manager. He can tell you everything -- and I'm not speaking about the good things -- about the bad things.
"Also for [players], he is a huge motivation. He makes this perfect, because he knows where there is this line where he can [push you] more or a little bit less.
"His performance as a coach is amazing, but not only as a coach but also as a man."