Not only Barca, Borussia Dortmund and Inter have also won the 'big ear' trophy throughout their glory history.
Barcelona are immersed, possibly, in the toughest group of this Champions League league 2019-20 alongside Borussia Dortmund, Inter Milan and the most affordable Slavia Prague. The top three are champions of Europe and there are no more groups among the other seven that have so many clubs with UCL trophies on their list.
There are two groups with two continental champions: Bayern Munich and Red Star in group B playing against Olympiacos and Tottenham, Ajax and Chelsea in H competing against Valencia and Lille.
In A there is only Real Madrid, which will be seen with PSG, Galatasaray and Club Brujas; in C there is no champion between Manchester City, Atalanta, Dinamo Zagreb and Shakhtar Donetsk; in D there is only Juventus against Atletico Madrid, Bayer Leverkusen and Lokomotiv Moscow.
In E only Liverpool against Naples, Red Bull Salzburg and Racing Genk; and in G, only Benfica against Olympique Lyon, Zenit St. Petersburg and Red Bull Leipzig.