United looked on course to drop points at the Amex Stadium on Saturday after Solly March’s late equaliser pulled Brighton level.
But United were awarded a penalty in the closing stages of injury time and Bruno Fernandes converted the spot-kick to secure three points for United.
After the game, Solskjaer poked fun at Mourinho by joking that United were fortunate their former manager was not at the ground to measure the goal posts.
In his post-match interview Solskjaer said: ‘First of all you have to be happy that Jose is not here to measure the goal posts – it might have been a smaller goal!’
However, Mourinho has hit back at Solskjaer by claiming that he should be more concerned with the dimensions of the penalty area – a clear reference to the high number of spot-kicks United have been awarded.
Asked if had measured the goalposts before game against Newcastle, Mourinho told Sky Sports: ‘No, because I know the goalposts are fine.
‘I think Ole yesterday was so happy and so surprised with what happened to his team that he had a joke.
‘But I understand that for him the dimensions of the goalpost are not important for him.
‘What is important is the dimensions of the 18-yard box. He would never accept to play with a 17-yard box, I think he would prefer a 22-yard box. For him, it would be better.’