It felt like the whole football world was fascinated by the previous clash between Celtic and Rangers in February.
One of the sport's most famous derbies was the only show in town on a night when Ange Postecoglou 's men roared to the Premiership summit.
But the Old Firm can still draw mammoth interest from across the globe even on a day Juventus and Inter battled in the race for Serie A title, as well as big games in the Premier League and La Liga.
