The English outfit has reported the Portuguese side to UEFA after Mario Balotelli and Yaya Toure were allegedly subjected to monkey chants over the course of the 90 minutes.
The English outfit has reported the Portuguese side to UEFA after Mario Balotelli and Yaya Toure were allegedly subjected to monkey chants during City's 2-1 win.
However, Porto has now hit back, claiming that the 'abuse' was all just a misunderstanding of the fans' support for Brazilian forward Hulk and City striker Sergio 'Kun' Aguero.
"What we can basically say is that nothing abnormal happened, no one noticed anything strange, not even the UEFA delegates who worked closely with Porto during the match," club spokesman Rui Cerqueira is quoted as saying by The Telegraph.
"Kun, Kun, Kun; Hulk, Hulk, Hulk - those chants can be easily confused with racist chants.
"We are very proud of having a multiracial team, with players from all backgrounds and to have achieved many titles with respect.
"Porto players have never felt the slightest hint of racism and we were very surprised with the accusations."
The two clubs will meet at the Etihad Stadium for the second leg next Wednesday.
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