Lewandowski has reached huge heights since joining the Bundesliga in 2010, signing him for Borussia Dortmund for £4million. It was under the current Anfield boss that it all started.
The pair enjoyed a stunning four seasons together, with Lewandowski plundering 103 goals in 187 games as Klopp steered Dortmund to two Bundesliga titles and the DFB-Pokal.
“When the second season [at Borussia Dortmund] began, I was still struggling. I also felt that Jurgen wanted something from me, but I didn’t understand exactly what,” Bayern Munich striker Robert Lewandowski told The Players’ Tribune.
“So after a really bad defeat to Marseille in the Champions League – I think we lost 3–0 – I went to see him. I said, ‘Jurgen, come on. We have to speak. Just tell me what you expect from me.’
“I can’t remember everything he told me – my German still wasn’t the best – but through the few words I knew and from his body language, we understood each other. We had a great chat. It was a mental thing, a hang-up of some sort. And I think it had something to do with my father.
“At the time I didn’t think about it. But now I realise that my conversation with Jurgen was like one of those I wish I could’ve had with my dad [who died when Lewandowski was a teenager]. One of those I had not been able to have in many, many years.
“Jurgen was not only a father figure to me,” Lewandowski added. “As a coach, he was like the ‘bad’ teacher. And I mean that in the best sense of the word.
‘Let me explain. Think back to you when you were in school. Which teacher do you remember the most? Not the one who made life easy for you and never expected anything from you.
No, no, no. You remember the bad teacher, the one who was strict with you. The one who put pressure on you and did everything to get the best out of you.
That’s the teacher who made you better, right? And Jurgen was like that.
He didn’t want it for him. He wanted it for you.”