Atalanta's tactical strengthening post-round 4 has been focused on building their defensive stability, with the team making several key developments and strategic adjustments to improve their chances in Serie A.

One of the most significant changes made by Atalanta was the addition of new defenders to the squad. The club signed experienced central defender Jannik Vestergaard from Copenhagen for a reported fee of €15 million. Vestergaard is known for his aerial ability and commanding presence at the back, which will be crucial in helping Atalanta defend against high-pressure opponents like Inter Milan and Juventus.

In addition to Vestergaard, Atalanta also brought in experienced full-backs in Marco Verratti and Cristian Nacolotti. Both players have played under various coaches over the years and have experience in different systems, which will provide valuable insights into how to best utilize Atalanta's attacking players.

Another key development was the signing of experienced midfielder Luca Modrić from Real Madrid. Modrić brings a wealth of experience and leadership to the team, and his arrival will complement the talents of the likes of Andrea Belotti and Edin Dzeko, who have already shown they can be effective strikers when given space.

The tactical adjustments made by Atalanta were also centered around improving their defense. The team has shifted towards a more conservative approach, with coach Gian Piero Gasperini implementing a three-man backline that prioritizes possession and counter-attacks rather than relying heavily on set-pieces or direct attacks.

This shift away from traditional 4-3-3 formation has allowed Atalanta to create more opportunities for their forwards, while also providing more security defensively. With the team now focused on creating chances through possession-based play, it will be interesting to see how this affects their performance in upcoming matches.

Overall, Atalanta's tactical strengthening post-round 4 has been marked by a focus on building their defensive stability. With the addition of new defenders, midfielders, and a new manager, the team is well-positioned to compete at the highest level of Italian football. As the season progresses, we can expect to see more changes and adjustments as Atalanta looks to secure a top-four finish and potentially even a Champions League spot.