Eckhard Krautzun managed Klopp as a player at Mainz before being succeeded by him in the role in 2001.
Speaking in an interview with The Set Pieces, the 76-year-old retired manager, who remains in contact with Klopp and a longstanding friend in former Manchester United manager Sir Alex Ferguson, revealed the Liverpool’s boss’ interest in Old Trafford.
“It would be his dream to go to England one day and his favourite club would be [Manchester] United. That’s what he said,” Krautzun said of a conversation he’d had with Klopp.
Krautzun also detailed discussions held with Ferguson about the possibility of Klopp one day moving to the Premier League and choosing the Red Devils.
“I said, ‘Jürgen Klopp, if he goes abroad, if he goes to England, his love would be Manchester United.’”
Klopp would join Liverpool after leaving Dortmund in October 2015 while United were going into a second season with Louis van Gaal at the helm.
Back in June 2015, Krautzun discussed Van Gaal’s suitability for the United job, telling Goal: “[Sir Alex] Ferguson is open, humorous and with both feet on the ground. This could be valid with Van Gaal, too. I just think, he gets misunderstood too often, because people take him too seriously.
“When he was a young coach I visited him at Ajax and back then he was very open and helpful with typically Dutch humour. For sure he is not unsympathetic.”
Liverpool face Premier League leaders United at Anfield in the lunchtime kick-off on Saturday, with Klopp’s side seven points behind Jose Mourinho’s team.