Manchester United manager Jose Mourinho had water and milk thrown at him in a row following Manchester City’s derby win at Old Trafford, the BBC reported.
United were upset at what they viewed as an excessive City reaction to Sunday’s 2-1 win, which sent them 11 points clear at the top of the table.
City’s players celebrated with their fans after the final whistle and coaching staff tried to persuade manager Pep Guardiola to join them, but he refused.
After the players headed down the tunnel, it is understood Mourinho made his feelings known in the corridor from which both dressing rooms are accessed as he made his way back out to do post-match interviews.
The City camp reacted, with Brazil goalkeeper Ederson and Mourinho exchanging words angrily in Portuguese – but Mourinho carried out his post-match media engagements as normal and made no mention of it.
The Daily Mail also reported that City coach Mikel Arteta was left with blood running down his face from a cut to the head, apparently as a result of the skirmish, although it has been stressed no punches were thrown.