Tottenham Hotspur have made some unwanted summer transfer window history after they became the first Premier League side to not make any signings in a summer transfer window since it first became a thing in 2003.
Fred, Diogo Dalot and Lee Grant all arrived at United by early July, but nobody has followed despite Mourinho's explicit desire to bring in two more players.
"Or they are investing massively like Liverpool, who are buying everything and everybody", Mourinho told MUTV after his team's 1-0 friendly loss to Bayern Munich Sunday.
A man now on the books of MLS side D.C. United said: "I am sure Jose (Mourinho) has been getting the team right".
"The list that I gave you before of the injured players is an important list and today after training I will speak with that group [of World Cup players] because everybody is different physically and mentally to see how they feel, how they are and to understand if they think how they can help or not help".
"My view is that first of all it is hard for me to believe that we finished second when I listen, when I read - not much but sometimes I do", the United boss said.
'Its hard for me to believe we finished second.
"Is hard for me to understand, to feel, to believe we finish second - which I keep saying, and it is sometimes hard to believe, that I won eight championships and three Premier League's but I keep feeling the second last season was one of my biggest achievements in the game".
"But I hope someone can catch them - it would be nice, so hopefully Manchester United can".
"The target is Leicester match and the tactics to be changed in Championship Manager you can just press a button", he said.
I repeat: "pre-season hard when you don't have your players to work, as simple as that". In football, you need time to work and players on the pitch to work and we didn't have until now.