Not only in the Champions League but this season Atletico are still struggling in the domestic league so I don't expect anything from them for the Champions League.
Griezman's drastic decline in Barcelona's performance still continues at Atletico at this time and Morata's presence is still quite good but this still can't do much.
Currently they are at the bottom of Group B with 3 points although there is a chance for them to qualify for the next round but I am quite skeptical about this.
Atletico experienced a very difficult situation this season, they are only in 6th place in the La Liga table. Sure, how we can expect a big thing from Atletico in UCL.