Brzenska played for Klopp at Borussia Dortmund.
He told Goal: "He's outstanding. He has his difficult sides too but the speeches and his training were something completely new.
"We noticed immediately that he is a special coach. He was always honest with me. I was told in advance that they weren't planning to work with me anymore, but I did the pre-season anyway.
"Afterwards he came to me and said that I had played a good pre-season but unfortunately they didn't count on me anymore.
"Dortmund had brought in two new central defenders, Neven Subotic and Felipe Santana. So I knew that I would have no more prospects at the club."