United play Champions League holders Real Madrid and German champions Bayern Munich in their next two friendlies before hosting Leicester City in the opening league fixture on August 10.
However, despite the new season looming there is hope for the Red Devils yet; if United's executive vice-chairman Ed Woodward is willing to open up the chequebook and Mourinho can sign several of these players, Man Utd may finally return to former glories.
Two of the world's most powerful clubs will meet in Miami on Tuesday as Real Madrid faces Machester United at Hard Rock Stadium as part of the International Champions Cup.
'I would like to have two more players, ' he said following the defeat.
Lukaku and Rashford's decisions to return early from holiday will however help, with Mourinho confirming they - along with Jones - would come back three days early.
Mourinho, who still retains the support of a majority of United fans, cut a miserable figure throughout the tour as he complained, but the spirit is good among United's players.
Manchester United defender Chris Smalling may have taken a dig at James Corden for his allegiance to West Ham United, but the Englishman's club mate Ander Herrera has taken the rather diplomatic route by applauding the talk show host's loyalty to the Hammers.
Gareth Bale started for Real but his only chance of note was a curling shot that went wide.
Madrid pulled one back on the stroke of half time through Karim Benzema but United saw out the second half to secure a morale-boosting win over the La Liga giants.
"So if I get one player until the end of the market, that's fine".
"The boys tried everything, they gave everything, they know we have to try to fight for the best result but tactically it means nothing".
Martial has had his first-team opportunities limited by the arrival of Alexis Sanchez in January.