Barcelona is a football club that has been successful for many years, but they have struggled in recent seasons with their defensive weaknesses. To address this issue, Barcelona has made some changes to its starting lineup and goalkeeper.

One of the most significant changes has been the addition of Marc-André ter Stegen as the new goalkeeper. Ter Stegen is a highly skilled and experienced goalkeeper who has played for several top clubs including Bayern Munich and FC Barcelona. He has also won numerous awards, including the Ballon d'Or in 2018. His arrival at Barcelona has already had a positive impact on the team's defense, as he has shown his ability to make crucial saves and keep the opposition from scoring.

Another change that Barcelona has made is the introduction of a new formation. The team has switched from a 4-3-3 to a 3-5-2, which has allowed them to be more organized defensively. This formation requires more defensive players on the pitch, which has helped to improve the team's overall performance.

In addition to these changes, Barcelona has also focused on improving the team's midfield. They have signed players such as Pedri and Ferran Torres to strengthen their midfield, which has given them more options when it comes to playing attacking football.

Overall, Barcelona's changes to its defense and formation have had a positive impact on the team's performance. With the addition of a talented goalkeeper and the introduction of a new formation, the team now has the tools to compete at the highest level. It remains to be seen whether these changes will lead to success in the upcoming season, but it seems that Barcelona is taking steps in the right direction.