The Bulgaria star, who will line up against England tomorrow, left Eastlands in the summer to join Bolton on a free.
And Petrov, 31, rapped: "At the moment at City people are becoming more bad than good.
"The human relationships are lost and the trust is lost too. In this situation the players are going to play like millionaires in games and are not a team on the pitch."
City have taken four points from three games this term - and were beaten 1-0 at Sunderland on Sunday.
Petrov was left fuming after City offered him just a one-year extension to his contract.
He told Bulgarian newspaper Trud: "100 per cent no, I don't miss City. If I accepted their one-year offer now I would be on loan somewhere else.
"At City nothing is clear. The team are looking for identity."