Lewandowski was signed for €4.5m (£3.3m), which, at the time, was a substantial outlay for a club who were still feeling the financial effects of their 2005 administration.
While the Pole went onto to excel at the Signal Iduna Park, he endured a frustrating first season at the club and was unable to hold down a first team spot in his preferred centre-forward position.
Klopp elected to deploy Lewandowski in the number 10 role behind Lucas Barrios, which was a source of consternation for the Polish forward.
Lucas Barrios in action for Dortmund
Image credit: Reuters
"Borussia first expressed an interest after my first year in Poznan," Lewandowski told the November 2015 issue of the magazine.
"When I left after the second season, I wanted to take the next step -- but suddenly I was playing in a No. 10 role. I was quite mad because I wanted to play up front.
"It was only in the following year that I realised how much I had learned while playing in that position. I told myself: 'You have become a better player.' Then I realised why the coach had asked me to play as a No.10; he made me a more complete player."
Lewandowski, now regarded as the pre-eminent striker in world football, scored eight goals in 33 games during his first season.
The 27-year-old left Dortmund to move to Bayern on a free transfer in the summer of 2014 having scored 103 goals in 187 games for Dortmund.