I don't think Real Madrid, Barcelona, or Atletico Madrid will drop any points this week. All three teams will win their matches. While Atletico Madrid's match was a bit tough, I think they'll ultimately get the three points because they desperately need them. They played two very poor league matches. This is a chance to forget that.
The most important thing is that none of them underestimate their opponents, as it's not uncommon for underestimated opponents to spring a surprise in any match. So, the three teams you mentioned simply need to improve their performances to win this weekend, especially Atletico Madrid, who haven't won in their first three games of the season. So, Atletico Madrid really needs to win at home to avoid being criticized by their own fans for facing an opponent that isn't strong enough this season.
I will not be surprised if any of these three teams drops points this weekend because these players are human beings they just got back from the international break and they really needs to rest and regain strength , before performing at a high level as for athletic Madrid they have been struggling ever since the start of the season.