It is the end of September 2015 when Marc Kosicke's phone rings.
The 48-year-old advises trainers: David Wagner, Julian Nagelsmann, Florian Kohfeldt and Ralf Rangnick are among his clients.
And Jürgen Klopp, who asked his friend in 2006 whether he would like to support him.
When Kosicke takes the call, a certain Ian Ayre answers.
He is sports director of Liverpool FC and has a concern, he says.
The phone call only lasts a few seconds. Kosicke asks the man to report via Facetime so that he can see him during the conversation. He hangs up and quickly Googles the name to find out what the other person is looking like. When his cell phone rings again and Ayre's face appears on the screen, he knows that he's not a trickster. Kosicke always does this when he doesn't know the person you're talking to.