Manchester United boss Jose Mourinho has suggested Sergio Aguero made the most of the incident that led to Marouane Fellaini's sending off for headbutting Manchester City's striker.
Fellaini, 29, was shown a straight red in the 84th minute, seconds after being booked for tripping the Argentina star.
United held on for a goalless draw.
"I didn't watch but probably I can guess it's a bit of a red card and that it's a bit of a very experienced, smart Argentinian player," said Mourinho.
Asked whether Belgium midfielder Fellaini was foolish for his actions, Mourinho added: "Marouane says it was a red card because he is Marouane.