By Frank Dalleres When Manchester United identified Sporting Lisbon’s Ruben Amorim as the man to succeed Erik ten Hag as manager they did what dozens of leading European clubs have done in the last 20 years: look for a Portuguese coach. From Jose Mourinho to Jorge Jesus, Andre Villas-Boas to Leonardo Jardim, Nuno Espirito Santo to Marco Silva and many more, a country of just 10m inhabitants and only slightly larger than Scotland has become a production line of coaching talent. Including Amorim, there are as many Portuguese coaches in the Premier League as there are English. Across the top seve…