West Ham boss, Sam Allardyce, has hit out at Louis van Gaal and claims Manchester United should have backed David Moyes like the Dutchman. United let slip a two-goal lead for the first time in Premier League when they lost 5-3 to Leicester and recorded the worst Premier League start with only five points in five games under Van Gaal. "A normal United would have regrouped and won 5-3 at Leicester, not lost. You don't expect them to go under like that. Apparently they are in transition," Allardyce told The Sun.