Manchester United manager Ruben Amorim says his side were "poor" and "need to improve" despite progressing to the fifth round of the FA Cup following Harry Maguire's controversial last-gasp winner.

Harry Maguire scores a 93rd-minute header to give Manchester United a 2-1 win over Leicester City in their FA Cup fourth round tie at Old Trafford. From bartender to England boss - Rangnick ...