Porto were upset at City's complaint, with Cerqueira saying that chants in support of "Kun" Aguero and Hulk had beenmistaken forracist abuse.
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Porto are also seemingly unhappy that fans chanted "cheat" at the Brazilian forward because of perceived play acting and are seeking an official investigation, the Guardian reported.
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A Porto spokesman, Rui Nike Air Force I
City lodged a complaint themselves two weeks ago after Yaya Toure and Mario Balotelli were subject to alleged racist chanting at the Estadio do Dragao in the first leg. UEFA has opened a disciplinary case into that matter.
Cerqueira, said the Portuguese side will report the matter on the grounds that City's fans acted in an improper way.
Cerqueira also reportedly told a Portuguese news agency: "This kind of behaviour may be normal in England, but we want to eradicate it from football."
Porto are preparing to make an official complaint to Brown Air Force 1 UEFA because Manchester City fans were chanting: "You're not incredible," at visiting striker Hulk during Wednesday night's Europa League match, according to reports.
"Kun, Kun, Kun; Hulk, Hulk, Hulk," Cerqueira said. "These can be easily confused with racist chants."
City won the tie 6 1 on aggregate.
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