Stephan El Shaarawy scored two impressive goals and Roma outclassed Chelsea for a surprisingly one-sided 3-0 win in the Champions League on Tuesday that prevented the English Premier League champion from advancing with two rounds still to go. With Alisson's consistency, Roma has the best defense in Serie A with only five goals conceded in 10 matches.
Chelsea had chances to respond before half-time.
An ill-judged backpass across goal by Kolarov presented Alvaro Morata with a chance to level - the Spain striker blazing over - before Roma sprung forward to double their advantage nine minutes before the break.
David Luiz mis-judged a long ball allowing Dzeko through and was relieved to see Thibaut Courtois save from El Shaarawy.
The tactical changes allowed the visitors to maintain some more consistent possession but it was Roma who looked more risky as the repeatedly caught Chelsea on the counter.
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Kolarov fed Perotti, who danced by Pedro and struck a low shot under Courtois. Allison saved Marcos Alonso's curling effort and Tiemoue Bakayoko headed wide from the following corner.
"Our group is a tough group with Atletico Madrid and Roma".
Central defender Kostas Manolas, who had come on as a late substitute, nearly became the next Roma name on the score sheet with a bullet header, but Courtois pulled off a spectacular reaction save to deny the Greek global.
It was a bad night for the Blues.
Despite this terrible performance and result Chelsea still find themselves in a relatively comfortable position in the group, especially since Atletico Madrid failed to beat Qarabag in the Spanish capital.