"We believe a lot in our players and there's no point now to say, why not repeat a similar season like a year ago or the season before, and with more experience".
This summer has already seen some mega-deals take place regarding Premier League clubs with Riyad Mahrez moving from Leicester City to Manchester City for a huge £67m, whilst Naby Keita joined Liverpool for £62m in a deal that was agreed on last summer. Ivan Perisic, the Croatia global, also featured prominently on Mourinho's wish list but it now seems that United's summer transfer business will be restricted to the arrivals of Fred, the injured Diogo Dalot and Lee Grant, signed from Stoke City as a third-choice goalkeeper.
"I am still expecting them to be very strong this season, and I actually think that, along with Liverpool, they will be a lot closer to Manchester City this time". He's one of the players that I have to speak to, to see how physically and mentally he feels.
The former Arsenal and England striker believes the Reds' summer transfer business can catapult them above Pep Guardiola's record-breaking champions.
Pushed on whether there would be any ins or outs on Thursday, Mourinho added: "The information I have is no (nothing will happen)".
But Mourinho has been keen on bolstering his squad further after they finished second last season, 19 points behind champions Manchester City. Any deal for Tottenham's Toby Alderweireld was a way off on the eve of the deadline and interest in Barcelona defender Yerry Mina has been tempered up until now by prohibitive financial demands.
Mourinho, who will be without the likes of Nemanja Matic, Antonio Valencia, Ander Herrera and Marcos Rojo on Friday, once again bemoaned the lack of preparation time for the start of the season, with many of his players having just returned to training after taking time off following the World Cup.
"They returned on Monday", he said.
"Unavailable is Romero - he had a surgery after his injury before the World Cup. They trained on Monday, Tuesday, Wednesday and today, so you can imagine that they're not really fit and ready, but we have needs", said the boss of the quartet. "Every team in the league will be thinking 'what a great midfield that is.' The way in which United are being talked about this pre-season it's as if they've got a load of bums playing for them".
"But I keep saying and thinking and feeling that the second last season was one of my biggest achievements in the game".
"We didn't sell players and with 25 players in the squad it is hard to add players".