The 25-year-old, who spent two years at Old Trafford under a lease agreement, said Ferguson had not done enough to persuade him to stay at the champions.
City paid a reported 25.5 million pounds for Tevez whose "economic rights" were owned by agent Kia Joorabchian.
"Alex never called me or sent me any text messages," Tevez, who signed a five-year contract, said.
"The only time he spoke to me was after the match against Roma because we had to discuss me playing for Argentina.
"I don't think that is the way to treat a player who has been two years at the club."
"There's been contact and there is a deal to be done possibly but it's not been concluded as we speak here," Hughes said.
He said City's potential was a major factor in him moving across the city.
"Both the technical department and the ownership came with a very good proposal for me and this showed that they have the ambition to become one of the biggest clubs in the world," he said.
"Money was not a factor for me."
"In every team you have to win the respect of your team mates and sweat the shirt," he said. "I would not be happy if I was assured a first-team place."
"I have fantastic respect for John Terry, as a great player and as an outstanding captain. But he is a Chelsea player at this moment in time so we have to respect that," he said.
CITY FANS! Check FourFourTwo.com’s ever-expandinginterviews archivefor more stuff to read:
One
