As Manchester United know very well, no transfer is ever really entirely free of risk in the madcap world of player trading. But when it comes to signing talented up-and-comers from the Portuguese Primeira Liga, recent history tells us that there is plenty of value to be found in the Iberian market. Of course, the first name that comes to mind is Bruno Fernandes. Surely the most successful signing of the post-Sir Alex Ferguson era. And a long time ago, Cristiano Ronaldo. Manchester United will be hoping that Manuel Ugarte – who followed in Fernandes’ footsteps at Sporting Lisbon and arrives ’e…