Manchester United lost 2-1 against Arsenal to crash out of the FA Cup . Former United player Danny Welbeck scored the winning goal at Old Trafford . Louis van Gaal 's tactics and decisions have looked unsure this season . Comment: CLICK HERE for all the latest Manchester United news .
Manchester United lost 2-1 against Arsenal to crash out of the FA Cup . Former United player Danny Welbeck scored the winning goal at Old Trafford . Louis van Gaal 's tactics and decisions have looked unsure this season . Juan Mata and Radamel Falcao were unused substitutes on Monday night . CLICK HERE for all the latest Manchester United news .