Bayern Munich star Robert Lewandowski says Jurgen Klopp is a manager with "two faces."

Lewandowski worked with Liverpool boss Klopp at Borussia Dortmund, where they won two Bundesliga titles.

And the Pole called Klopp the best manager he has ever worked under.

"I think...Jurgen Klopp [is my favorite] and after that Pep Guardiola. 100 percent," Lewandowski said of the German.

"[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."