Yerry Mina, Toby Alderweireld, and Harry Maguire were all linked with a move to Old Trafford, but nothing marterialised, with the fees being way too high.
Manager Marco Silva was also expected to land Chelsea defender Kurt Zouma on loan as he supplements an £80million summer spending spree at Goodison Park.
Ed Woodward has also been thrust into the limelight with Mourinho moaning at the lack of signings this transfer window.
But United begun to reassert control, and for all Leicester's promising play they struggled to fashion any clear chances; it was Claude Puel who blinked first, making a double change on the hour-mark that saw Jamie Vardy enter the fray.
'So I will have to focus on the players I have and in relation to these first couple of matches.
The Ivorian global was signed by Mourinho for £30m in 2016 and fans consider him to be the best centre-back at the club.
Mourinho's transfer targets were not shared by the United board.
The Ecuadorian wing-back, who recently turned 33, has been one of the most reliable players during Mourinho's two-year reign in Manchester. Unlike the majority of the United side, Sanchez enjoyed a full preseason and will be raring to go.
Mourinho splashed out £89m in 2016 to make the Frenchman United's club-record signing.
After a £52m deal was struck with Shakhtar Donetsk before the World Cup, the Brazilian midfielder agreed to join Man United.
After a brilliant World Cup, Perisic is now worth nearly double that figure.
Leicester have failed to win in 7 previous Premier League matches against Manchester United with only one victory in last 18.
It's reported by The Sun that United were actually prepared to shell out £100m for French World Cup victor Varane, but Real Madrid were not interested in selling.
As soon as the second goal was netted Pogba was substituted and received a much-deserved standing ovation from the Old Trafford crowd, with Mourinho joining in before giving him a huge slap on the back in a very public bid to quell the talk of a rift.