Aston Villa draw the curtain on their pre-season adventure with an away clash against Borussia Dortmund at Signal Iduna Park. For Unai Emery and Aston Villa, it’s been a chequered pre-season in terms of results, beating Athletic Bilbao last time out but losing their three matches prior. Now supporters will get a real taste of where their squad is currently at ahead of their clash against West Ham next weekend, with Villa facing Borussia Dortmund. Having secured a late win against Bilbao, Emery will expect his players to take it up a notch on Saturday evening and put in a statement performance….