Atletico Madrid got an additional player for the defense from Chelsea, namely César Azpilicueta. Because his contract expired at the end of June, César Azpilicueta's status became a free agent and Atletico took advantage of this opportunity to secure the services of the Chelsea veteran. His contract with Atletico lasted for two seasons and it was a good deal for César Azpilicueta to finish his career at Atletico. Diego Simeone certainly can't wait to give direction to the former Chelsea captain and his experience will certainly provide motivation for other Atletico players.
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https://twitter.com/FabrizioRomano/status/1675030473834389505César Azpilicueta's experience might mean a lot to Atletico Madrid, but at 33 years of age, of course, his quality is not as good as before and he can't play optimally anymore, but because the transfer fee is free, Atletico Madrid is a little lucky.
So far I haven't seen any significant movement in the Atletico Madrid team to improve their team to overshadow next season.
Indeed, his performance will be very far from before and considering he is already 33 years old, of course he will look more like running out of stamina before 90 minutes. However, Azpilicueta is still a defender with a lot of experience and while at Chelsea he has defended for 10 years before he finally decided to leave this summer. Atlético, indeed, there is still no significant movement for the recruitment of new players and for now Simeone must have made a list of which players they will bring in. It's only a matter of time and I'm pretty sure there will be a new striker or a new midfielder that Atletico will sign.
Atletico Madrid is actually not making any big movement as you said. Which I really think that they should make otherwise they are not going to improve as a team. I remember the Atletico Madrid team being really good in the Lahm, Arda Turan era. It was probably in the 2014-2016 era. It is actually incredible to see how the team has deteriorated in terms of performance And also in terms of quality.
Atletico Madrid is lucky to get him for free. But they should understand that great players are not going to be free.