Radamel Falcao led Manchester United 's attack in Under 21 game at Old Trafford . Rafael , James Wilson and Victor Valdes also started in strong line-up . Falcao has just 10 first team games to prove his worth to Louis van Gaal . Manchester United must fork out £43m if they are to sign Falcao on permanent deal . Colombia international Falcao earns £280,000 a week at UnitedManchester United .
Radamel Falcao led United 's attack in Under 21 game at Old Trafford . Rafael , James Wilson and Victor Valdes also started in strong line-up . Falcao has just 10 first team games to prove his worth to Louis van Gaal . United must fork out £43m if they are to sign Falcao on permanent deal . Colombia international Falcao earns £280,000 a week at Manchester United .