He said that as of now I'm going to have more options in the build-up, to play both short and long balls.
Those reasons for excitement include the arrival of striker Romelu Lukaku for £75 million (S$132 million) from Everton, Chelsea's Serbia midfielder Nemanja Matic (£40 million) and Sweden defender Victor Lindelof from Benfica (£30 million).
Javier "Chicharito" Hernandez will make his second debut for a Premier League club this weekend.
Mourinho's side begin their Premier League campaign at home to West Ham on Sunday having enjoyed a strong pre-season, winning six out of seven friendlies before losing to Real Madrid in the UEFA Super Cup on Tuesday.
"It's not something urgent, that we are desperate to have it done or not done, I just think that he was very clear by showing what he did a year ago was not enough for him".
But the Belgium global failed to convince Mourinho during their time together at Chelsea and will be playing in the Champions League proper for the first time.
"You've got to be able to overcome those hard experiences that are going to come in this league".
"The club was clever like that because we anticipated what we needed after last season".
I'm going to be courageous and say the game will finish 4-0. "I just think he was very clear showing what he did previous year was not enough for him".
Hernandez admitted that he is not sure whether he would celebrate a goal at Old Trafford, and refused to predict how many times he could find the back of the net over the course of the season.
Stopping short of a guarantee, Mourinho believes an encouraging pre-season and success in the Europa League last season can propel his side to further success.
'Obviously [we wanted] a player for another position playing from the sides, but we have players and if you can not strengthen the team in these areas, we have people that we trust and we go for it'. "For any neutrals, they will be the team to watch this season - the hottest ticket in town".