The 2018 International Champions Cup kicks off on Saturday, with Premier League champions Manchester City facing Borussia Dortmund at Chicago’s Soldier Field in the opening fixture of the preseason tournament which takes place across three continents.A World Cup summer has shifted the focus away from the club game, but with most major leagues now in the final stages of preparations for the new season, what questions do the big clubs need to answer during the ICC?How will Real Madrid shape…