Mourinho, who will lead United into the home leg of their UCL tie with Sevilla tomorrow, was hitting back a De Boer who said it was "a pity" for Marcus Rashford that Mourinho is his manager.
United face key games this week against Sevilla in the Champions League and Brighton in the FA Cup.
I read some quote from the worst manager in the history of the Premier League, Frank de Boer - seven matches, seven defeats, zero goals. I would say he was in the top five with more matches for two season and applies to Scott [McTominay] the best thing to happen is to have experience.
Here, we take a look at some of the factors that may influence whether Mourinho gives the young forward more opportunities. I have to be honest and give the credit to the people of the academy that was responsible for his formation, to Mr [Louis] Van Gaal [Mourinho's predecessor] who was responsible for his first season. "I'm more comfortable in the middle, but if you get past a player on the left that's where you are going to be". I try to give the best to the kid.
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Not trusting young players is a stick Mourinho has been beaten with since his first spell at Chelsea but a stat has been unearthed that will change your mind on everything you've heard about Rashford recently. But Mourinho is not like that. He wants to get results.
After all the discussion of whether Rashford is fading away under Mourinho at Man United, the Special One threw him a start against Liverpool and he kindly paid him back with a brilliant brace to win the staunch rivalry.
"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.
"Normally he's an English player, you want him given time, he can make mistakes. There are 11 players that start, it's just one of those things". I'm really happy too.
After the game it was revealed that United are nearly unbeatable at Old Trafford in the league when they take the lead in the first half. "It's kind of been sorted out but we're still talking about it so there is nothing to totally confirm yet", he said.