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Last month Manchester United midfielder Angel Di Maria was shown a red card for grabbing the shirt of referee Michael Oliver during their FA Cup tie with Arsenal.

The incident escalated when Oliver booked the Argentina international for diving, a decision that led to Di Maria tugging the referee's shirt in retaliation.

It was later reported that the former Real Madrid man called Oliver a 'son of a b****' in Spanish - 'hijo de puta.

The red card later led to United boss Louis van Gaal commenting on the situation, he said: “I think he’s touched the referee and that’s forbidden in every country, so he has no excuses."

Tonight Sky Sports cameras picked up Manchester City captain appearing to place his hands on the same referee, yet didn't receive any punishment.

Earlier in the season Oliver's decision making was brought into question, coincidentally it was against Manchester City once more at the centre of the debate.

We brought you the story of Joe Hart appearing to lean his head onto the referee, a gesture that would normally result in a red card if it was only players involved.

With their closest rivals seemingly getting away with two incidents of touching the referee, Manchester United fans are unsurprisingly unimpressed: