Asked at the Levi's Stadium, after watching his side draw 0-0 with San Jose Earthquakes, whether there will be more signings, Mourinho told a news conference, via ESPN: "One thing is what I want and another thing is what is going to happen".
Despite this, Martial has only shown flashes of the same ability since, and his development ha been hamstrung by Mourinho's distrust of him, which has led to Martial essentially being dropped after every game in which he fails to either score or provide an assist.
One player who could be on his way out of United is Anthony Martial, who has made no secret of his frustrations in Manchester having missed out on France's World Cup-winning squad after making just 18 league starts last term.
The domestic transfer window closes on August 9, but English clubs can still sell players to other European clubs until the end of the month in most cases, while the deadline in France does not close until mid-September.
"During a season, you can have a big match then a smaller match, then one even smaller, then you can lose your focus, you can lose your concentration, then comes a big match again". "In the World Cup, the direction of the emotion, of the responsibility, of the big decisions is always growing up [further]". This feeds the concentration of a player.
"I think sometimes it is hard to get to know him as a person, as a character because of the way he is".More news: Toronto police delving into life of gunman in mass shooting
With Ibrahimovic injured last season, Mourinho played Lukaku with the Belgian scoring 16 Premier League goals.
Mourinho believes Pogba stepped up because he was inspired to represent his country on the world's biggest stage.More news: Crude oil futures rise 0.81% on firm global cues
'At the same time, I think players in the World Cup, they really feel that extra commitment with a country, with the people, that extra responsibility that makes them - by the emotional point of view - to be sometimes even over-committed. So I think it's the flawless environment for a talented player like him to focus, to full focus on the job'.More news: Andrew Lincoln Leaving 'The Walking Dead' in Season 9 - Rick Dies?