Speaking to BBC Radio 5 Live, Falk said: "I have been working on the story since May but Jurgen always hesitated - he wasn't sure he wanted to make that step. He won't have to work so hard as he did at Liverpool. He won't have to watch football every day.
"It is true it is controversial. There is a big discussion in Germany at the moment about 'has he sold his soul?'
"I would say no, because Leipzig is a big club. Of course it is hard in particular for Dortmund fans because there were big fights and they have always said it is a tinpot club - it is not traditional.
"But, by the end, after say a month or so, it will die down. The love for Jurgen Klopp in this country means he can almost do anything."