Barcelona are dealing with a mounting injury crisis with key defender Andreas Christensen joining forwards Raphinha and Ferran Torres on the sidelines ahead of Tuesday's crucial Champions League tie against Olympiacos. The growing absentee list, which already includes Robert Lewandowski and Dani Olmo, heaps pressure on Coach Hansi Flick as the Blaugrana prepare for the season's first El Clasico against Real Madrid on Sunday.