The statistic may not be that surprising to match-going United fans who know that Rashford features in nearly every game, across all competitions, but to the wider public it blows a gaping hole in the recent accusation from some quarters that Mourinho is somehow holding the player back and denying him of game time.
Rashford is set to feature in England's squad for the 2018 FIFA World Cup in Russian Federation and might be granted a more prominent role than expected as Gareth Southgate waits to find out the severity of the ankle injury Harry Kane suffered during Tottenham's 4-1 win over Bournemouth on Monday (AEDT).
De Boer is the owner of the shortest reign as manager in Premier League history.
"If he was coached by Frank he would lose because he lost every game".
"(Pogba) did (train) after you left", Mourinho said.
"I have to be honest and give the credit to the people of the academy that was responsible for his formation, to Louis van Gaal [Mourinho's predecessor] who was responsible for his first season".
Speaking to reporters ahead of the second-leg against Sevilla, the Portuguese coach suggested the 20-year-old is "in the top five players with most matches" since he took charge in 2016.
De Boer said he thought it was "a pity" Rashford played under Mourinho. But Mourinho is not like that.
The perception of United as a pragmatic team set up to get results continues to grate with Mourinho as he faces Sevilla following a goalless draw in Spain three weeks ago.
"If he has one or two not good games, he puts him out".
"It is a special game because it would be a very important step for the club".
"Does he play every match from the start?"
Furthermore, the signing of Romelu Lukaku has seen the Englishman deployed as a winger on numerous occasions, and De Boer does not believe Mourinho has the patience to allow Rashford the necessary room to develop. I try to give the best to the kid.
"When you are in the last 16 it looks really, really far, but when a team gets in the last eight you start smelling the semi-finals". Mourinho said he did not know whether the midfielder would be available but Pogba had trained after the open part of Monday's session closed. "It's kind of been sorted out but we're still talking about it so there is nothing to totally confirm yet", he said.
Michael Carrick has confirmed he will retire at the end of the season. "That's pretty much where I'm at".