Chelsea suffered a Champions League setback as a slack performance led to a 3-0 defeat to Roma on Tuesday
Stephan El Shaarawy put the hosts ahead with a brilliant strike after just 39 seconds - the fastest goal in the Champions League this season
El Shaarawy added a second before half-time after an error from former Roma defender Antonio Rudiger, and the home side took advantage of another mistake to score a third in the 63rd minute through Diego Perotti
The win sees Roma move to the top of the group, one point ahead of Chelsea, who, on a night when they were well below their best, were grateful to see Qarabag hold Atletico Madrid to a 1-1 draw in Spain
That result means Chelsea are still well positioned to finish in the top two in Group C, and was the only positive as the Blues suffered their joint-biggest defeat under Antonio Conte
Roma made a dream start in the Italian capital as El Shaarawy fired in a superb first-time effort from the edge of the box with just 39 seconds on the clock
Chelsea looked as though they would soon respond in an open game as Eden Hazard was denied by Alisson and then Alvaro Morata shot over from close range
But it was Roma who scored next after a poor error from Rudiger, letting a long ball run past him for El Shaarawy to latch onto and flick past Thibaut Courtois
Tiemoue Bakayoko should have reduced the deficit late in the first half but he headed wide from a corner
Willian was introduced in the 56th minute but Chelsea continued to make too many errors and were eventually punished as Cesc Fabregas misplaced a pass and Perotti fired in from 25 yards
Chelsea showed little urgency in chasing a comeback and were fortunate not to lose by more as Perotti blazed over after some terrible defending and then Kostas Manolas saw a point-blank header saved by Courtois
El Shaarawy's first-half double proved to be decisive
 The Italy international opened the scoring in style, firing a first-time shot into the corner with the outside of his boot after just 39 seconds
El Shaarawy continued to look positive on the ball and he took advantage of a lapse in concentration from Rudiger to score the second
 Was given a standing ovation when he was replaced in the second half
Chelsea will look to bounce back when they host Manchester United on Sunday, live on Sky Sports Premier League
 The Blues are next in Champions League action when they travel to Qarabag on Wednesday, November 22
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