Manchester United boss Jose Mourinho has labelled former Crystal Palace man Frank De Boer as the 'worst manager in the history of the Premier League'
Mourinho hit back after De Boer criticised his handling of forward Marcus Rashford, who scored a brace in Saturday's 2-1 victory over Liverpool.
Rashford has seen limited first-team opportunities for United this season, particularly following Alexis Sanchez's arrival from Arsenal in the January transfer window.
The 20-year-old has played a part in 40 games in all competitions this season, most not being a full 90 minutes, and has contributed 12 goals and eight assists.
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De Boer praised Rashford after the win over their Merseyside rivals and claimed that it is a 'pity' the forward plays under Mourinho at Old Trafford.
That prompted an angry response from the United boss in his pre-Sevilla press conference on Monday.
On De Boer, Mourinho stated "I read some quote from the worst manager in the history of the Premier League, Frank de Boer. He was saying that it is not good for Marcus Rashford to have a coach like me, because the most important thing for me is to win.
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"If he was coached by Frank, he would learn how to lose because he lost every game."
"I have to be honest and give the credit to the people of the academy that was responsible for his formation, to (former Manchester United boss) Louis van Gaal, who was responsible for his first season.
"But if you go to his numbers and how many matches he played with me last season and this, I would say probably he's in the top five players with more matches in the two seasons."