Barcelona faces a monumental task this week: overturning a 2-0 deficit against Atletico Madrid to keep their Champions League dreams alive. The atmosphere at the Metropolitano will be electric, and the Blaugrana must attack with purpose while maintaining defensive discipline. But there's an added layer of tension for several key players, who are walking a disciplinary tightrope.

Heading into this must-win second leg, five Barcelona stars are just one yellow card away from suspension. A booking would rule them out of the first leg of the semi-final—should Barcelona complete the stunning comeback. This puts manager Hansi Flick in a tricky position, demanding aggressive play to overturn the deficit while pleading for calculated challenges.

The list includes young sensation Lamine Yamal, whose attacking flair is crucial, alongside Gerard Martin, Fermin Lopez, and Marc Casado. The recently added name is full-back Joao Cancelo, whose marauding runs from defense are a key part of Barcelona's play. Each of these players has been instrumental in the European run so far.

There is a silver lining, however. UEFA rules state that all yellow cards are wiped clean after the quarter-finals. This means any player who navigates the Atletico match without a booking will have a clean slate for the semi-finals. For Barcelona, the immediate mission is clear: fight for every ball, score the necessary goals, and do it all with a level of composure that keeps their key men available for the battles ahead.