Alejandro Garnacho is heading into his first ever international tournament with Argentina. After a long season with Manchester United, Alejandro Garnacho has had a little rest in the lead-up to the Copa America. In two recent international friendlies Argentina played against Ecuador and Guatemala, Garnacho was an unused substitute. Does this mean Garnacho is an afterthought for manager Lionel Scaloni? Or is the Manchester United teenager being kept in reserve as a ‘secret weapon’ for the tournament? READ MORE: Who is Alejandro Garnacho? Meet Man Utd’s dazzling ArgentineAlejandro Garnacho squad…