Manchester United legend Rio Ferdinand has told Marcus Rashford to hit back at Ruben Amorim over recent comments.
Last month, Rashford was left out of Amorim's squad for United's derby clash against Manchester City.
Since then, the 27-year-old has not played for the Red Devils and has been heavily linked with a move away from Old Trafford.
The Englishman also revealed to journalist Henry Winter that he is ready for a new challenge.
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On Sunday night, after United's 1-0 win over Fulham in the Premier League, Amorim pulled no punches as he claimed he would rather have his 63-year-old goalkeeper coach on the bench over Rashford.
Reacting to Amorim's latest comments, ex-United and England defender Ferdinand has urged Rashford to hit back.
Marcus Rashford told to hit back at Manchester United boss Ruben Amorim
As reported by The Standard, Ferdinand said on his podcast: "If I was that player that the manager said that about, my heart, my pride, my ego - embarrassment. For someone to question your application, to question (whether) you're going out there and giving 100 per cent for your team, (suggesting) that you're going to slack off and you're taking shortcuts...
"We all have days off or moments when we're not performing well, lacking confidence, but effort isn't really one of the things I would want to be hearing a manager say is lacking in my makeup.
"That's a damning comment, because I think he knows what the reaction is after that comment. He's not saying that without thinking, 'Where does this go after?' There's really no way back for Marcus after that, I don't think, with that type of comment."
Ferdinand said that if he was in Rashford's shoes, he would be coming out 'all guns blazing' and even threatened to sue the manager.
The 46-year-old continued: "If it isn't true and it was me he said that about, I am coming out all guns blazing. I'm holding a press conference, I'm coming out and saying, 'I'm having no-one chat about me like that in the media'. But you only come out if you're 100 per cent sure that nobody can say you take the shortcuts.
"Sometimes I think in these situations, if you're doing things right, communicate it. Because the manager can question how well or bad I'm playing, or my form, but if he's questioning my effort, I'm sorry, I'm coming back out, next time I'm around any press people - 'the effort, he needs to take that back or I'm suing him'.
"I would love to sit across the table from Marcus, look in his eyes and go, 'Can you say that? Could you be confident enough to go out and do that? Because if you can't, look at yourself'."
United are back in action on Thursday night when they take on FCSB in the UEFA Europa League.
Topics: Rio Ferdinand, Marcus Rashford, Football, Manchester United, Ruben Amorim
Marcus Chan