Although the Liverpool game was Rashford's first league start this year, he has played 39 games for United this season has scored 12 goals.
The United boss had an acerbic response to hand when he addressed a news conference ahead of Tuesday's Champions League showdown with Sevilla, seemingly holding De Boer responsible for Palace's slump extending to seven winless and scoreless matches as Roy Hodgson picked up the pieces at Selhurst Park.
"If Marcus would be coached by Frank, he would learn how to lose".
Here, we take a look at some of the factors that may influence whether Mourinho gives the young forward more opportunities. "The best thing that can happen to a kid is to have experiences and Marcus is having them".
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Slightly critical of Mourinho, and you feel De Boer's criticism would be better aimed at the high pressure setting of a top four club as the reason for Rashford's stunted development.
"It's a pity that the manager is Mourinho because (Rashford) is an English player and you want him to be given time", De Boer said, according to BT Sport. But Mourinho is not like that. "It is good that I can be around Marcus to have a laugh and reassure him that it's going to come good and that if he gets a chance he will perform and he has done that".
"In these types of games, when the pressure is on you, you just be yourself and I think that's what seems to happen in these games and the team seems to react well, when maybe we don't react as well in other games", said the 20-year-old. Whether it's when he rushes forward, tracks deep into his own half or stands up to players nearly double his age to defend his teammates, there is something rather curious about Marcus Rashford that makes him just like Cristiano Ronaldo. "There are 11 players that start, it's just one of those things".
As for Rashford, we doubt the young local kid who scored both goals in a 2-1 win over Liverpool has too many complaints about his lot in life at the moment. Of course not but he is a player that we trust. "It's kind of been sorted out but we're still talking about it so there is nothing to totally confirm yet", he said.