Langerak revealed that although Klopp was a firm disciplinarian whose intensity and uncompromising style often resulted in training-ground bust-ups, he was also a caring and loving manager who treated his players as if they were his sons.
The former Melbourne Victory goalkeeper said that Klopp was any footballer's dream coach because of his brutal honesty and absolute fairness.
Give him everything and he'll back you to the hilt, Langerak said of Klopp who has taken Liverpool to two straight UEFA Champions League finals.
The two crossed paths at Borussia Dortmund from 2010 before they both left the club in 2015, Langerak joining Stuttgart and Klopp moving to Anfield.
Liverpool meet Tottenham Hotspur in this year's European showpiece in Klopp's third final after his Dortmund side lost 2-1 to Bayern Munich in 2013 and the Reds fell 3-1 to Real Madrid last year.
Langerak, who plays for Nagoya in Japan, said he was a huge admirer of the man who gave him his Bundesliga break and who has since turned around Liverpool's fortunes with his management skills that bring the best out of his players.
He said Klopp was as intense and demanding away from the cameras as he is on the pitch and always came across as a father figure to his players.
"For me the biggest thing is his man management and intensity, day in day out," he said.
"There was never a day that was wasted on the pitch. He demanded that every shooting drill or small game be done at a high intensity. It wasn't unusual to have boilovers between players or Klopp himself throwing in wild tackles and getting stuck into each other.
"But then after training or the next morning he'd be giving out hugs and making jokes and all was forgotten. He was very much like a father figure which is something he told me when I first signed."
Langerak said despite the high demands on his players, Klopp had a softer side and cared a lot about the people around him.
"I remember in the change-room before a Bundesliga game he found out that my dad worked in the coal mines in Queensland for 30 years and he said he couldn't believe that someone from a small country town made it to Germany to play there," he said.
"For me it's normal and it's my story but he was obsessed and asked me about it for what felt like 10 minutes just before a game and all I was thinking was 'ok, I guess we both better get ready for this game now, no?
"I also hold fond memories of his last season at Dortmund in 2015 and how lucky I was to play in his last matches as our coach. In his last game we lost the German cup final and the way the fans celebrated him after and still celebrate him to this day is phenomenal. He also sent me a very thoughtful personal text message after he left which I'll never forget."
Langerak was Borussia's number two behind Roman Weidenfeller and played only 36 competitive matches for the yellow and black's first team but the experience gained by working with stars like Mats Hummels, Marco Reus and Robert Lewandowski was invaluable.
He never let down his coach or teammates whenever he was called upon, particularly in a German cup semi-final against Bayern in 2015 when he helped his club to victory by saving a penalty from his former teammate Mario Gotze.
"I was 21 when I went to Dortmund and Klopp told me that each player is like his son and he would be fair and honest with everyone and protect us like we were his sons," he said.
"He also told me that no player at BVB would ever have a problem with him as long as he could see them living and training at 100 per cent intensity - then it didn't matter if you made a mistake or didn't play well.
"One thing every single player wants in a coach is someone who is honest and fair. You want to be treated in a fair manner and that was him all over."
Klopp has become a chief exponent of 'gegenpressing' which is the method of pressing the opposition when the ball is lost in a bid to win it back as soon as possible.
Some teams go into a defensive shape after they lose the ball but not Dortmund or Liverpool.
"It's interesting because as certain people became obsessed with 'beautiful' high-risk playing out from the back he didn't care for it at all," Langerak said.
"It was more about the other parts of the game and the philosophy of 'gegenpressing' and high intensity football. Once or twice we were promised a day off if the team covered a certain amount of kilometres in a match."
Langerak said he will be rooting for Liverpool and his former mentor in the all-English final in Madrid on June 2 (AEST).
"I'll be watching the final, no question," he said.
"I hope he gets the trophy in his third final because he deserves it."
