Jürgen Klopp would have been the perfect fit for Manchester United.

He had made Borussia Dortmund a European powerhouse, playing an exciting brand of attacking football. He's respected and admired by just about everyone. His infectious personality and ready laugh give him a charisma that lights up our television screens. As much as anything, the German was available, but United decided to stay with Louis van Gaal for another season and eventually José Mourinho became the Dutchman's successor — not a bad option, it must be said.

It was Liverpool who brought Klopp to the Premier League a year ago and for that we should be grateful. On Monday, Klopp and Mourinho go head-to-head for the sixth time and their first Merseyside-Manchester clash. It will be like nothing else they have experienced in their previous five meetings of which Klopp has won three, drawn one and lost one.