Arsenal manager Arsene Wenger was not a happy man after he lost yet another Premier League game against Jose Mourinho's Chelsea.
The Frenchman was particularly upset with referee Mike Dean who sent off defender Gabriel Paulista in the first half after the Brazilian clashed with Chelsea striker Diego Costa.
And according to Wenger, the Spaniard should have been sent off as well.
"He [Diego Costa] will do the same again next week and the week after that and he always gets away with it," Wenger is quoted as saying by the BBC.
"Costa can do what he wants and yet he stays on and everyone who responds to him has to be sent off. He hits [Laurent] Koscielny in the face yet he gets away with it.
"I understand referee Mike Dean's decision to send Gabriel off. He was guilty and should not have got involved but why does Costa stay on the pitch after what he has done?
"Costa is always involved in provocation and he used the naivety of Mike Dean well. It is nothing to do with the strength of a referee. You expect him to make the right decision."