Manchester - Louis van Gaal admitted on Friday that he has no answers to explain Radamel Falcao's failure to make his mark at Manchester United.
Falcao's troubled spell with Van Gaal's side hit a new low in midweek when he lasted just 71 minutes of an Under-21 game against Tottenham, a demotion that was intended to improve the on-loan Monaco striker's fitness and sharpness.
The United manager has refuted suggestions that Falcao's presence with the club's youngsters could be interpreted as an embarrassment for a Colombia international who would cost £43.2 million to sign on a permanent deal from Monaco.