"At this time, we had a deal with Corinthians, but Carlos is still a City player," said Mancini told Sky TV.
According to the news media, the deal will be unveiled during a personal requirements between Tevez (27) and his new club was approved.
Brazilian club that offers a transfer of 40 million euros (63.57 million dollars) for the player but the City striker's transfer request is more for their captain was reported to raise its bid and the Corinthians.
The striker wants to leave Manchester because of his daughters lived in South America with their mother.
Argentina forward, who had joined West Ham and Manchester United, led the City won the FA Cup and qualify for the Champions League last season.
Tevez, who was playing for the Argentina national team at Copa America, began dabbling in English football with West Ham from Corinthians in August 2006.
Tevez said Monday, "I have no problem to return to the Corinthians," where he contributed to the victory the club won league titles in 2005 and became a player favorite.