The teeming rain never assists the image of a failing football manager and there have been times when it has proved career-defining. For many, Steve McClaren will always be the Wally with the Brolly.
But the sight of a rain-drenched Ruben Amorim, hair plastered across his forehead, fiddling with little tactical magnets on some kind of board which he’d laid across his knees in the Grimsby Town away dugout, really took bad optics to another level, as his Manchester United team humiliated themselves.

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