De Boer had praised Rashford after his impact in Saturday's win over Liverpool and said it is a "pity" the 20-year-old plays under Mourinho at Old Trafford - prompting an angry response from the United boss.
De Boer made the comments after Rashford scored both goals in United's 2-1 win over Liverpool at Old Trafford at the weekend.
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It's absolutely brutal from Mourinho but it's actually impossible to argue with his assertion that the former Inter Milan manager is the worst manager that the Premier League has seen, statistically at least.
Jose Mourinho did not mince his words when it came to responding to criticism from former Crystal Palace boss Frank de Boer. "I have to be honest and give the credit to the people of the academy that were responsible for his formation, to Mr. [Louis] Van Gaal, who was responsible for his first season". The best thing that can happen to a kid is experience and Marcus is having this'. He plays for United many matches, he starts some comes from the bench for others.
Rashford is set to feature in England's squad for the 2018 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 Sunday.
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"I think that Gareth Southgate doesn't mind that I say a couple of minutes of our conversation were about Marcus", said Mourinho.
Rashford was the star of the show in the Red Devils' blockbuster encounter with bitter rivals Liverpool, finding the back of the net with two magnificent finishes - the first of which has drawn several comparisons to Cristiano Ronaldo. "I'm really happy with Marcus".
We're starting to play more like a team and Rashford stepping up in Anthony Martial's absence is testament to that. Not many were expecting him to start against Liverpool and he had a good match not just about scoring goals.
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He strums his battered guitar and sings a star-making rendition of "Unaware" by Allen Stone . For a quick recap of the week, here are some of the highlights you just won't want to miss!