Mihajlovic worked at Inter under Mourinho's predecessor Roberto Mancini, but says the players have taken their game to a new level with the Special One.
He explained: "Inter have been winning with both. With one important difference. Now, Inter players are on the field more convinced of their value. Mourinho has brought the right mindset. They're used to winning and they do so now with greater confidence."
On his problems as former coach of Bologna, Mihajlovic added: "There were different expectations. You always win at Inter. But Bologna has a great history, great tradition. These are two clubs that in different ways have an important part in Italian football."