Chelsea were already through to the knockout stages, but blew their chance to finish in first place and in theory earn an easier draw.
Saul's excellence has been a consistent theme in the last two years of Champions League football but, try as he might, he could not quite ensure Atletico's continued participation this year.
Antonio Conte's side are in third place in the Premier League table but are 11 points behind current leaders Manchester City as the west London side look to defend their top-flight crown.
"It is a fantastic competition". It was his third goal of the group stage and served notice that he has the ability to trouble the best.
"So let's hope they draw Besiktas on Monday and they don't have to worry about it, we'll see".
Chelsea piled forward as time ebbed away, and Stefan Savic turned Eden Hazard's cross into his own net as the pressure told.
Gareth Copley GettyImages
Causing Atletico all manner of problems, Morata almost caught out Oblak with a dipping strike from wide on the left that had the keeper scrambling to save. The reserve fixture at the Wanda Metropolitan, however, was a different story but thankfully at the end of the day didn't have any baring on how the group ended.
"We are Chelsea, we are a big team like them". "We didn't fail. This can happen. We are happy", the Belgian told BT Sport.
In Group B, Bayern Munich defeated Paris Saint-Germain 3-1, but it was not enough for them to top the group as Paris defeated the German club 3-0 in their first clash.
Romelu Lukaku after a long drought got back to scoring ways in the encounter while Marcus Rashord sealed victory.
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Last season's beaten finalists Juventus clinched a spot in the knockout round after beating Olympiakos 2-0 in Greece, Juan Cuadrado and Federico Bernardeschi on target for the Serie A champions. We knew it could happen. There was more angst to come for Chelsea in the closing minutes when Willian missed a sitter before Michy Batshuayi's stinging strike whistled wide.
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