Mourinho has been impressed by City's recent spending spree.
"In my first time you were always putting pressure on me saying 'You buy this, you spend that, you buy the title'.
"So I hope now it is on the other side.
"All the top five or six are rivals for the title. I don't see one more of a rival than another one. They're all good teams and all good players.
"But City just bought four important players that can improve their already fantastic squad."