Manchester United have plenty of reason to be optimistic after a solid showing in the Community Shield. Alejandro Garnacho was the Manchester United star who shone brightest in the Community Shield against City. Garnacho, 20, netted United’s goal which looked destined to lead to another Wembley trophy before a late City equaliser and narrow penalty shootout defeat. It was an effective showing from the Argentine, who missed the pre-season tour due to his involvement at the Copa America. READ MORE: Who is Alejandro Garnacho? Meet Man Utd’s dazzling ArgentineAlejandro Garnacho praisedAlejandro Ga…