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.
On the eve of the new season, which starts with United's clash against Leicester, Mourinho also claimed that finishing second last season, 19 points behind champions Manchester City, was "one of the greatest achievements" of his career. It gives us a couple of weeks to recover people and to prepare people better and to focus on the players that are available. I don't think just because they haven't signed a centre-back we should be sat here thinking "We'll let Manchester United off the hook, they shouldn't be challenging this year".
Mourinho warned last weekend that a "difficult season" could lie ahead if they failed to strengthen the squad before the deadline.
Jerome Boateng was another option but Bayern Munich have not been keen to sanction a loan move.
But this was only a "soft" closure - with some deals still able to be completed after this deadline.
Sky Sports pundit Gary Neville believes that Liverpool need to exit the Champions League early if they have any chance of winning the Premier League this season.
Sergio Romero, Valencia, Marcos Rojo, Dalot, Ander Herrera and Matic are all injured for Leicester's visit, while Mourinho needs to check on the fitness of those that returned late from the World Cup. "They trained Monday, Tuesday, Wednesday and today, so you can imagine they are not really fit and ready".
"We have only seen him when he has appeared in front of the TV cameras this summer and heard what he has told the media, and I suspect he will behave very differently on the training ground with his players". I think back to back titles is an obsession for them. Is not an opportunity, is a match, an important match, we would prefer to have a couple more days but decision was to be first to play and that's it.
The Portuguese believes runners-up are often portrayed as if they have been relegated and those who finish below them are presented as "serial winners".