Celtic take on Heart of Midlothian this weekend before their focus shifts to the Champions League next Wednesday. Slovan Bratislava are first up in Glasgow’s east end as part of eight exciting ties in the new Swiss-style format – four at home and another quartet away from Scottish shores. Borussia Dortmund, Atalanta and Aston Villa are among the glamour opponents in the league phase. Meanwhile, opportunities are there to get points on the board against the Slovak champions, Club Brugge Young Boys and Dinamo Zagreb. There is a tangible excitement that wasn’t felt heading into last season’s edit…