Bayern Munich striker Robert Lewandowski said his regular €50 bets with head coach Jurgen Klopp at Borussia Dortmund turned him into a goal machine.
Before conquering Bavaria, Lewandowski was Dortmund's main man under Klopp for four years.
"He was the one who gave me belief," Lewandowski told the Daily Mail.
"In the first three or four months in training, we would have this game — him against the striker. There would be a bet between me and him.
"In the first few training sessions, he was always winning! After that, not so much! Every time after, he lost! He didn't want to play anymore! It was €50 a game and by the end I had a positive balance! But I saw for the first time with him how important it was [to] train.
"I saw what I have to do on the pitch when I don't have the ball. You look at Liverpool now and how they play with the pressing. That is what I learned from him.
"He also improved my finishing. When I came to Dortmund, it wasn't so good. He told me to improve. He showed me what I had to do."
