The pupil welcomed his former master to the Emirates - and for a moment, it seemed the old hierarchy would remain intact.
Erling Haaland struck early, firing Manchester City into the lead in the ninth minute and setting the tone for what looked like another dominant display.
But as the match edged into stoppage time, it was substitute Gabriel Martinelli who broke through City's defensive wall, bulldozing past their parked bus to rescue a dramatic point with a 93rd-minute equaliser.
Daily Mail Sport breaks down the key talking points from the 1-1 draw at the Emirates.