Sevilla's defense has been under scrutiny recently as the team has conceded goals at a high rate against some of the top teams in La Liga. With this in mind, it is important for Sevilla to improve their defensive capabilities and prevent high-conceding teams from scoring.

One of the main reasons for Sevilla's poor defensive form is the lack of discipline on the pitch. Players have been guilty of committing costly errors and failing to clear balls accurately, leading to easy goals for opposing sides. To address this issue, Sevilla must focus on improving their communication and understanding of each other's positions on the field.

Another area that needs improvement is Sevilla's ability to deal with set-pieces. Many of their opponents have had success converting set-piece opportunities into goals, which can be particularly dangerous when played against a team like Sevilla who struggles to defend corners effectively. To combat this, Sevilla should work on their marking and positioning during set pieces, ensuring they are always prepared for potential threats.

In addition to these tactical improvements, Sevilla also need to develop a stronger mentality within their squad. A team that is willing to fight for every ball and give everything on the pitch will have a better chance of preventing high-conceding teams from scoring. This requires a positive mindset, as well as strong leadership from players such as Jose Callejon and Martin Odegaard.

Overall, Sevilla's defense needs to improve if they want to compete at the highest level in La Liga. By addressing areas such as communication, marking, and set-piece play, as well as developing a more aggressive mentality, Sevilla can make significant strides towards becoming a more solid defensive unit.