Media outlets in England and Italy had suggested Maicon could be used in a part-exchange plus cash arrangement for City forward Tevez, who wants a move away from Eastlands.
However, when asked directly if the Argentinian could be used to bring Maicon to Manchester, Mancini said: "No. Carlos is a City player. At the moment, we don't have any news from other teams, so Carlos will play for Manchester City.
"Carlos is a professional player. If he doesn't have another team in the next ten days or two weeks I think he will play for us and play serious like last year, like always."
When asked whether Tevez was likely to move before the transfer deadline, he said: "I don't know. A lot can happen in one month but if he stays I am happy."
Elaborating on when City fans might expect to see Tevez back at the club after his summer break was extended, Mancini said: "The agreement with Carlos was that he wouldn't play for 21 days after the Copa America."
Maicon's agent, Antonio Caliendo, also dismissed the notion of a swap deal, telling IlSussidiario.net: "One thing is for sure: Inter chief Massimo Moratti has no intention of accepting a player as part of a Maicon sale. The president wants just cash.
"It's hard to say how much. Last year he rejected a €25 million offer. If the same offer arrived this year I think he'd sell, but I'm not the one who sets the price. Inter will do that."
The need for the addition of a right-back nevertheless appears to be pressing for Mancini, who sold Jerome Boateng earlier in the summer. The Italian confirmed he only has one fit back-up right-back for the Community Shield clash with United, revealing: "Zaba [Pablo Zabaleta] is here because if we had a problem with Micah [Richards] we have only one fit right-back."
Mancini also defended Mario Balotelli, following the forward's recent claim that he does not like Manchester. "Mario doesn't change!" Mancini laughed. "I think he wanted to say he is missing his family and friends. I have spoken with him many times. He loves the supporters and team-mates and likes to play in the Barclays Premier League.
"He is young, 21 years old and probably missing his family. This situation can happen if you want to play in another country - it is normal. The problem for Mario is that he is alone. He doesn't have his family here every day. I can understand this, I don't think it is terrible.
"But we play for Manchester City, a top team in the Premier League. This for me is the best championship in Europe and it is a fantastic experience for players from other countries."