Pep Guardiola was involved in a heated debate with goalkeeper Vicente Guaita following Manchester City's goalless draw with Crystal Palace.
Guaita kept a clean sheet which could prove costly to Guardiola's side come the end of the season.
It opens the door for Liverpool to close the gap at the top to just one point, should they beat Arsenal on Wednesday.
But there was a bizarre confrontation after the final whistle between the goalkeeper and the Man City manager.
After the match, Guardiola did not reveal what the animated exchange was about beyond 'congratulating him for an incredible effort and his saves'.