It was staggering that Louis van Gaal did not turn to Radamel Falcao as Manchester United were trailing 2-1 against Arsenal in the FA Cup quarter-final. The poor lad must be thinking: What am I doing here? I know he is not the player United thought they were getting, but isn’t it down to the manager to get the best out of him? Radamel Falcao (second right) was an unused substitute during Manchester United's defeat to Arsenal . Michael Carrick (right) was brought on at half-time but Colombia forward Falcao was left unused . Goalscorers change games but instead they chased the match with Daley Blind and Michael Carrick, two sitting midfielders, on the pitch. Surely it would have been better to show greater intent by throwing on Falcao? United never threatened Arsenal once Danny Welbeck put them ahead and it is Arsene Wenger's side who have progressed to the semi-final at Wembley.
Radamel Falcao did not leave the bench as Arsenal beat Manchester United . Louis van Gaal brought on Michael Carrick, Phil Jones and Adnan Januzaj . Danny Welbeck, a former United striker, scored Arsenal's winning goal .