(CNN) -- Wayne Rooney has defended himself from criticism by Roberto Mancini following Sunday's Manchester derby, in which the United striker scored two goals but appeared to play a role in City's captain being sent off. 

City manager Mancini has officially appealed against Chris Foy's decision to dismiss Kompany in the 12th minute of the 3-2 home defeat that ended his side's English FA Cup title defense at the first hurdle, and blamed Rooney for influencing the referee. 

Kompany slid in with two feet to win the ball off United winger Nani, who did not appeal for a foul -- but Rooney ran straight to the official and Foy ruled that it was a dangerous tackle. 

"It was not a red card. Rooney told him his decision," Mancini told reporters after the match, before referring to an incident last week when he gesticulated from the touchline to have an opposing player punished. 

"When I did this against Liverpool, people told me not to do it. I said I was sorry and made a mistake." 

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Rooney, however, insisted on his Twitter account that he had done no wrong. 

"Funny how people think i got kompany sent off. Im not ref. i didn't give red card. But it was a clear red card. 2 footed tackle," he wrote on the social networking website on Monday. 

United boss Alex Ferguson agreed with Rooney that Kompany deserved to be sent off. 

"I think so, I've seen him do it before -- he maybe got off in the past. I think if he catches Nani then he's got a problem." 
For what?
influencing the referee