Marouane Fellaini had to be restrained from confronting referee Martin Atkinson in his dressing room, following his red-card shame in the Manchester derby.
The Man United midfielder had to be dragged away by stewards and team-mates after trying to demand an explanation from Atkinson at the final whistle.
Fellaini, 29 , picked up a yellow card in Thursday’s 0-0 draw for an 84th-minute trip on City striker Sergio Aguero – and received a straight red just 16 seconds later for headbutting the Argentine after fouling him again.
United boss Jose Mourinho later accused Aguero of faking injury following the goalless draw. Fellaini also felt he had been conned.
An eyewitness in the tunnel said: “Fellaini was in tears and stamping his feet.
“He was screaming ‘I want to know why, I want to know why’ as he stormed towards the referee’s dressing room. He was fortunate that some stewards managed to restrain him before team-mates ushered him back into United’s dressing room.”
Fellaini will now miss the next three games – and the Belgium international was fortunate his ban wasn’t extended for failing to leave the pitch immediately.
Jose Mourinho reacts to Manchester United’s 0-0 draw at City
However, the FA may still hit United with a fine over the conduct of their players as a number of Fellaini’s team-mates surrounded Atkinson after the incident.
City were hit by a £35,000 sanction in March after being charged with failing to control their players in a game against Liverpool.
United have declined to comment on the matter.