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#2 Leaky defense in Europe
Barcelona's struggles in the Champions League for the past few years has a lot to do with the number of goals they've been conceding. Since claiming the tournament in 2015, the Blaugrana have been coming up short in terms of their efforts at the back - especially in the decisive games.
During the 2015/16 campaign, the Catalans were thrashed 4-0 by Paris Saint Germain. Although they later managed to edge past the French giants courtesy of an unbelievable comeback, they couldn't repeat the feat against Juventus, who sent them packing from the tournament with a 3-0 battering.
They were also embarrassed by Roma, who overturned a 4-1 defeat to knock the Blaugrana out with a 3-0 victory in Italy - while the 4-0 humiliation suffered at Liverpool last season is still fresh in memory. Barca simply can't win the Champions League if they continue to concede at such a rate.
