Barcelona's defense has been under scrutiny recently as they have struggled to keep clean sheets in two consecutive matches. The Catalan giants have conceded three goals in their last two games against Atletico Madrid and Real Madrid respectively.

The defense is one of the strengths of Barcelona, but it seems that the team is not performing at its best. The lack of defensive solidity has led to several mistakes from the back line, which has contributed to conceding goals. The team has also failed to organize themselves defensively, leading to easy scoring opportunities for their opponents.

One reason for the defense's struggles could be the injury of key players such as Gerard Pique and Jordi Alba. These players are vital in the defense, and their absence has left a void in the team's defense. Additionally, the team has struggled with the formation used by manager Quique Setien, which has resulted in a lack of organization on the pitch.

To improve their defense, Barcelona will need to make changes to their tactics and formations. They may consider playing a more organized defense or using different players in their backline. It is also important for the team to focus on improving their defensive discipline and communication, as these factors can significantly impact the team's performance.

In conclusion, Barcelona's defense has been struggling recently, and it is essential for the team to address this issue if they want to compete at the highest level. By making changes to their tactics and formations, focusing on improving their defensive discipline, and working on the formation, Barcelona can improve their defense and regain their form.