The Chelsea boss claimed Manchester United were not an "unbelievable team" last season, while the 34-year-old defender warns his side should not be ruled out of the title race
Mourinho claimed neither United nor Manchester City had been "extraordinary" champions in the past two seasons.
"That was his first sound bite of the season, wasn't it? I think we expected it," Ferdinand said of the Chelsea manager's comments.
"I'm looking forward to Chelsea. We are really looking forward to it. Now we can start playing for something."
United's credentials were questioned before the start of the campaign following a string of unconvincing pre-season results but David Moyes' side launched their defence of the title with a 4-1 victory at Swansea City on Saturday.
"We are professional people and want to win. You don't appreciate it when people don't put you in the position you should be," Ferdinand said.
"Being champions you warrant maybe a little bit more but every next person is tipping someone else to win the league and putting us in third or fourth place.
"It seemed people thought we should have come away with zero points and there would have been a lot of noise if we'd lost.
"The vibe all week was people wanted it.
"So it was nice to go there – especially in the gaffer's first real competitive game – and to win convincingly – as we did."