Even with the poor recruitments, the 20-time champions will be expected to win the Premier League title.
Mourinho's Red Devils kickoff their campaign against Leicester City tomorrow.
Harry Maguire, who could face United for Leicester today, Bayern Munich's Jerome Boateng and Toby Alderweireld of Tottenham Hotspur were all linked with United, while Atletico Madrid's Diego Godin emerged as a late target yesterday.
Mourinho has bemoaned United's lack of first-team regulars during pre-season with several of their players returning to the club late following their involvement at the World Cup in Russian Federation.
"I said that during preseason and it looked like I was saying something absolutely out of order, something insane, I repeat: Preseason is hard when you don't have your players to work, that's as simple as that".
The Ivorian worldwide was signed by Mourinho for £30m in 2016 and fans consider him to be the best centre-back at the club.
"If you compare with Europe, you are at a complete disadvantage and it does not help the clubs in the Premier League", Pochettino said on Spurs' tour of the United States.
As time went on the Portuguese settled for two signings and then claimed he's expecting only one more player to be bought.
Schmeichel was called into action again 10 minutes into the second half, going low and to his left to keep out a Matteo Darmian line drive from distance as both teams looked to up the tempo of the match after the break.
Despite slashing a club-record 60 million pounds on signing Riyad Mahrez, City has enjoyed a quiet window.
After a £52m deal was struck with Shakhtar Donetsk before the World Cup, the Brazilian midfielder agreed to join Man United.
The summer window promised much but delivered little for Mourinho, though he can at least take heart from marquee signing Fred's promising debut.
After a brilliant World Cup, Perisic is now worth nearly double that figure.
Chief football writer Daniel Taylor writes: "United's conclusion was that in most cases Mourinho had targeted defenders who were no better than those they already had".