"If it is not possible, we will continue fighting, working and believing in those we have".
The Toffees captured one of United's targets - Colombian defender Yerry Mina from Barcelona - as well as Portugal winger Andre Gomes from the same club and Brazilian winger Bernard who previously played for Shakhtar Donetsk.
In May, the world-class Spanish goalkeeper won Manchester United's Player of the Year award for the fourth time in five seasons.
After a three month break, Premier League football has returned.
The ingredients appear to be in place for another Mourinho meltdown should United get off to a bad start and he believes even the scheduling of his side's opening fixture has made his task even harder.
"Monday, Tuesday, Wednesday, Thursday (to prepare) is not enough". I don't know their identity right now, I don't know how they can dig deep and turn a losing position to victory and they style that they'll come out with. We have to try the best with every player'.
'If they feel they can help us [against Leicester on Friday], if it's 20 minutes, 10 minutes, half an hour. We don't have many solutions and want to go with everything we have.
Jose Mourinho selected a youthful squad to take to America after a number of players were missing due to the World Cup.
While the United hierarchy is known to be reluctant to sell the young striker, Mourinho has endured a trying time in his relationship with Martial after he left United's American pre-season tour to attend the birth of his child and did not return - missing nine days of training.
"In pre-season it looked like I was saying something absolutely out of order, it looked like I was saying something insane", he added.
The former Chelsea boss has clearly become very frustrated with Ed Woodward's inability to deliver signings.
Speaking of United it's been interesting to watch Jose Mourinho warming up for his usual third season melt down, which is due at Old Trafford this season, as he's started picking his fights in pre-season.
"I have my players and I like my players, I like to work with my players", said Mourinho.