Ruben Amorim has been accused of neglecting one of his key duties as Manchester United head coach by refusing to adapt his tactics. The reigning FA Cup holders suffered defeat in the fifth round on Sunday, crashing out to Fulham . After clawing a goal back in the 71st-minute, the Red Devils went on to lose 4-3 in the penalty shootout . The latest upset added to a long run of poor results under Amorim , who since taking charge in November has racked up nine losses across all competitions, only