How long can Klopp vs Guardiola remain a friendly rivalry?

The Liverpool and Manchester City managers have maintained a respectful relationship as the title rivals prepare to go head-to-head at Anfield

The noise grew quickly. A low hum which got louder and louder.

Cheers and whistles, a ripple of applause. Enough to grab the attention away from the man at the front of the room.

Pep Guardiola was holding a post-match press conference at the MetLife Stadium in East Rutherford, New Jersey, but nobody was listening now.