Tevez spent two years on loan at Old Trafford before securing a permanent switch to Eastlands over the summer and has not kept quiet over his dissatisfaction of being kept on the bench by the Scot.
Ferguson, for his part, has played down the significance of the Argentine's departure, whilst also warning Man City that it will be difficult to break into the top four this season. However, Tevez feels his former boss is worried about the Manchester derby on 20th September.
"Ferguson is history for me but I know that he is scared of playing against us," the striker told Globoesporte. "It's dangerous for Ferguson's objectives and for him to criticise Manchester City."
Tevez has also explained the differences between playing under Ferguson and working with current manager Mark Hughes.
"Mark Hughes is only focused on his work and the team, he doesn't get involved in the negotiations," he said. "He has been a football player so there is a big difference in the way he treats each player."