By Ewan Murray Aston Villa will play the third and final match of their United States pre-season tour this Saturday when they face Mexican outfit Club America. The Villans continue their preparations ahead of a season in which they will play Champions League football for the first time during the Premier League era. They have been busy in the transfer market as a result, with all of their summer signings having donned claret and blue already. While they enjoyed two 3-0 friendly victories prior to their trip to the US, results have been significantly worse since crossing the Atlantic. A sizeabl…