"Old Trafford is waiting for us and I think Old Trafford has a reason to be behind us", he said.
That however, won't be enough to bring United in the top five, if Mourinho doesn't sign more players.
"I know how much football means in England".
Mourinho acknowledged this week that Real Madrid's Gareth Bale was out of reach after the Welshman started for the Spanish side in their 2-1 European Super Cup win over United.
'I'm on fire, ' he smiled when asked to describe his mood.
While City's midfield may be stacked this season, there is always need for bodies when you compete in four separate competitions. It speaks to Mourinho's strength: clearly identifying his team's weaknesses, and working ruthlessly (and expensively) to correct them.
"Usually they would say it is time for them to leave, it was the right move for both parties".
"I am very happy to have him because he is one of those players with no question marks".
Meanwhile, Newcastle United also make their return to the Premier League, replacing their bitter, local rivals, Sunderland. Matic normally plays to a certain level (holds his hand up), sometimes a little above that and sometimes a little below.
"It's the way I trust the player is going to perform so I think it's a fantastic signing for us".
Key players: Anthony Knockaert was named Championship Player of the Season a year ago.
Ahead of the Premier League opener against West Ham at Old Trafford on Sunday, he said: "My initial analysis from January and progressing through other months I was thinking of four players but I am not a hard person to work with, even if looks different or you want to make it look so".
If Tottenham were playing at White Hart Lane I'd have them as champions.
"The only thing I have to do is work every day like I always do, the only demand on me is the one I put on myself", Mourinho said.
Given the equitable revenue distribution of the league's television fees, it isn't unrealistic to expect a new club to rise above their current standing.
With 14 clean sheets and just 29 goals conceded last season, De Gea is sure to do just as well, if not better this campaign.
The top six from last season have all retained their managers and it promises to be an exciting run of 380 games. I'm honest in my job. The Red Devils have not finished in the top three since 2013, but that's a streak that should end this season.
Strong and two-footed, he already owns two Premier League winner's medals.