Ruben Amorim has reiterated the 3-4-2-1 system Manchester United play in is not to blame for their struggles and indicated he would only be open to changing formations once the players have mastered the current one.

United have won eight of their 34 domestic matches with Amorim in charge and the League Cup elimination by fourth-tier Grimsby Town was a new nadir in the Portuguese's ten-month reign.

Amorim was questioned on the formation in the aftermath of the 12-11 penalty shootout defeat at Blundell Park yet defended his principles. At his pre-match press conference for the visit of Burnley, Amorim revealed that United's football leadership members asked him whether he would play with a back four.

The Portuguese revealed that he spent all of his playing career with Belenenses, Benfic

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