Ruben Amorim delivered a defiant response to suggestions he should change his 3-4-3 system at Manchester United following a 3-0 defeat at Manchester City by saying the club must "change the man" if they lose faith in his philosophy.

United suffered their third defeat of the season -- two in the Premier League and a Carabao Cup loss against League Two Grimsby Town -- as Pep Guardiola's team ended their two-game losing streak with an easy win against their neighbors.

The loss left Amorim with a record of just 8 wins in 31 Premier League games since replacing the sacked Erik ten Hag last November and once again exposed his refusal to abandon the tactical lineup he has operated since arriving at Old Trafford.

But when asked by reporters if United's poor results now merit a change in

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