A bad Champions League season for Atletico Madrid. Atletico Madrid will continue in the Europa League after losing away to Porto.
Atletico Madrid is at the bottom of group B, which means they won't play in the Europa League. 1st place and 2 nd place are qualified for the next round, while the 3rd place will join Europa League through. But 4th place (the bottom) will be eliminated from UCL and won't play in Europa League. As far as I know, only the 3rd place joins Europa League.
I think it is clear enough that Atletico Madrid has no longer an international competition. They will only play in La Liga until this season is over.
3 bad Laliga teams, not only Atletico Madrid. Barcelona, Atletico Madrid and Sevilla were really not as expected so Spain only got Real Madrid in the round of 16.
Barcelona will play in Europa League, it is not too bad. The worse team is Atletico Madrid, they won't play in both UCL and Europa League.
While Sevilla, it depends on Copenhagen. If Copenhagen can't win against Dortmund tomorrow, Sevilla will join Europa League.