Klose says moving to Germany transformed his life.
He recalled to his club's TV channel: "When I was 13 I still didn't know what I would do in my life and even though I came from a very healthy family, I encountered several problems.
"I had many older friends who drank and smoked and I, despite being a bad idea, decided to follow them. I clearly dreamed of becoming a professional footballer and in those years I played in the Basel youth teams, but I also spent most of my time between alcohol and smoking.
"I lived a parallel reality, I didn't really understand what was happening to me. One night I almost had a heart attack lying on a bench in a park near the lake. I don't remember where I was exactly. The next morning alone and it was a shock, only later, when I reached the age of 16, did I meet my wife and move to Nuremberg to find support of a mental coach that I still hear from today."