And the Portuguese coach simply suggested that the first three months of the season would prove whether his warning was right or wrong.
Unlike in England, the window for the rest of Europe's leading leagues doesn't close until later in August, meaning Premier League clubs have faced even more inflated prices when buying from the continent. In this moment, words are not important.
"This target seems unrealistic but if every fan donates just a pound we can help get back to attacking winning ways".
For starters, Willy Boly, Diogo Jota, Ruben Vinagre and Leo Bonatini, all key players on loan for their promotion success last term, have all been signed up on permanent deals.
However, the Spurs boss could see his squad stretched this weekend as an update on TottenhamHotspur.com confirmed the north Londoners will be without at least six players for the trip to the north east to face Newcastle.
"I believe in the way that we work and I have no doubt we will be competitive, with or without signings".
"One lie repeated 1,000 times is still a lie, but the perception of the people is that it's true but it's still a lie".
"I like my players and my group".More news: Chicago suffers gun violence surge over weekend
All in all, this promises to be an entertaining game between two sides I fully expect to finish around mid-table this season, if not higher.
Barcelona's Yerry Mina was linked with a switch to Old Trafford but financial demands from agents have ruled out any swoop for the 23-year-old, who impressed for Colombia during the World Cup, with Everton now favourites to sign him.
According to the Daily Mail, Mourinho was left "angry and frustrated" after the transfer deadline passed having being told by Ed Woodward that funds were available for a world-class defender. So he has to start again.
Pogba, meanwhile, could be on the bench against Leicester despite only training for four days since arriving back in Manchester following his triumph with France in Russian Federation.
Brazil global Fred, highly-rated but raw full-back Diogo Dalot and third-choice goalkeeper Lee Grant all arrived at United by early July, but nobody followed despite Mourinho's explicit desire to bring in two more players.
From what I've seen in training, Fred is a player who always wants to get forward.
"But it's the same conversation as with [Ashley] Young, [Marouane] Fellaini, [Jesse] Lingard, it's the same". If I felt we could not improve the team I would call my chairman and say: "I leave". We want to keep good ambition.