But now Ronald de Boer, who is academy team manager at Ajax, has added his two cents on the row, defending his brother while also seeking to play the feud down.
It was Rashford's first Premier League start of 2018 but the Portuguese coach was irritated at De Boer's comments.
With competition for a attacking berths being so intense, with the likes of Romelu Lukaku, Jesse Lingard, Juan Mata, Ashley Young and Anthony Martial all options, it was always going to be hard to play every minute of every game this term, but the Manchester native is certainly giving Jose Mourinho a tougher job deciding who to pick now.
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It would've been a great opportunity for De Boer to "go in on" Mourinho but the Dutchman took a more mature route with his response.
De Boer told Dutch outlet Algemeen Dagblad: "I respect him as a manager". That's something I can learn from.
"That way of playing, that is a different view than we are used to in the Netherlands".
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De Boer added: "I meant nothing personal about it, when I spoke about how Mourinho manages and the role that Marcus Rashford has under him at United".
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.
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