The Blues had entered the final round of group matches in pole position, but the result at Stamford Bridge and Roma's 1-0 home win over Qarabag saw the Serie A side win the group by virtue of their superior head-to-head record against Chelsea.
"This can be a new challenge".
Both clubs would prefer to play weaker teams in the next stage of the competition and if Liverpool fail to win against Spartak tonight either the Russians or Sevilla could become possible opponents for Chelsea in the last 16 stage.
Antonio Conte's side, who could be pitted against heavyweights including Barcelona and PSG in next week's last 16 draw.
Despite that, they look capable of breezing past Europa League teams of a significantly smaller standing in the latter stages of the second-tier competition.
"In this case, we know we could play Barcelona, PSG or Besiktas". We tried to create some chances in the second half.
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He also made it clear that while the draw options were less than ideal, Chelsea are a big enough club to be able to cope with whatever is thrown at them.
The fact that they can not play Real Madrid again in the next round probably gives them the most favourable list of potential opponents. In fact no side from the same country can play another at this stage.
Again Morata went close to the opener when he stretched to meet Victor Moses' cross, but Atletico goalkeeper Jan Oblak spread himself to block the Spaniard's close-range effort.
But Saul Niguez escaped the attentions of Tiemoue Bakayoko to plant home a header from Fernando Torres' near-post flick-on after 56 minutes. The only goal in that game was scored by Diego Perotti in the 53rd minute.
"Chelsea shouldn't fear anyone at the moment".