Atletico Madrid is indeed the main competitor between Barcelona and Real Madrid. They (Real Madrid and Barcelona) are always in the shadow of Atletico Madrid. Once they make a data error, it is not impossible that Atletico Madrid will take over their position in the standings. It's just that they are one step behind the two clubs, but their potential to bring them down is very high.
Atletico also has a good chance this season in La Liga. we know how Atletico performs in competitions like the Champions League.
when their chances are still big in La Liga I think Atletico can focus on chasing Madrid and Barca. but when the situation of Madrid and Barca is not overtaken, I believe Atletico will focus more on other competitions.
Yes, Atletico Madrid has great potential to interfere with Real Madrid's chances of defending the title. My prediction this season is that the La Liga title race will be competitive again, even though many people still favor El Real.