Barcelona successfully qualified directly for the Round of 16 in the UEFA Champions League after their impressive 4-1 victory over Copenhagen in the final match of the league stage.

Despite the big win, the team faces a clear defensive challenge, as Barcelona has not been able to keep a clean sheet in any of the eight league matches they have played, conceding 14 goals. This makes them the team that has conceded the most goals among the top eight qualifiers, compared to Atletico Madrid, which conceded 15 goals but finished in fourteenth place.

Under the leadership of Hans Flick, the defensive problem did not improve; in fact, it became more complicated. Since taking charge, Barcelona has played 22 European matches and conceded 38 goals, averaging 1.73 goals per match. The team managed to keep a clean sheet in only four matches, which is a very low rate for a team aiming to reclaim the Champions League title, according to the Spanish newspaper "Sport."

Analysts assert that this defensive gap represents the biggest challenge for Flick if he wants to compete for the title, especially in the knockout stages where even small mistakes are not tolerated. While the team's offensive strength is undoubtedly present, the lack of defensive balance could hinder their progress in the tournament.

As the round of 16 approaches, Hans Flick's primary task seems to be quickly correcting defensive errors to prevent conceding goals and to turn Barcelona into a real contender for the UEFA Champions League title.