Joe Hart appears to square up to referee Michael Oliver during heated Manchester derby Hart was livid after Chris Smalling attempted to block his goal-kick, for which the defender received the first of his two yellow cards. Images show Hart making contact with Oliver's forehead with his own, but the whistle blower didn't flinch and appeared to brush off the incident. It is possible Hart could face FA punishment. City won the match thanks to Sergio Aguero's 63rd-minute strike. It's not the first time that the fiery Hart has kicked off during a match, see the video below of the goalkeeper boot an advertising board in frustration when playing for England during the World Cup. WARNING: Video contains offensive language* United manager Louis van Gaal said after the match that Smalling's sending off was stupid. "In a derby you have to be careful - the second yellow card is a stupid yellow card," Van Gaal told the BBC."