The Belgian was given his marching orders for an alleged headbutt on the City striker, whom Mourinho has accused of over-reacting
Jose Mourinho felt Sergio Aguero's reaction to a clash of heads with Marouane Fellaini played a role in the Manchester United midfielder's red card.
Just 19 seconds after being booked for a tackle on the Manchester City striker, Fellaini was penalised for another foul on Aguero, who he headbutted in the aftermath.
Referee Martin Atkinson consequently showed the Belgium international a straight red card in the 84th minute, with United having to hold on for a 0-0 draw.