Stephan El Shaarawy struck twice, including the fastest goal of this season's Champions League after just 39 seconds, to help thrust AS Roma to the top of their Champions League group with a convincing 3-0 win over lacklustre Chelsea on Tuesday.

Following the sides' thrilling 3-3 draw in London two weeks earlier, the Italian international striker's brace was the highlight of another impressive display from Roma which allowed them to leapfrog the English champions at the summit of Group C.

El Shaarawy's thunderous first-minute shot was the earliest recorded in any match in the competition this term and, despite Chelsea creating early chances, Antonio Rudiger's defensive indecision allowed him to nip in for a neatly-taken second after 36 minutes.

Not for the first time this season, Chelsea again looked uncharacteristically disorganised at the back as Diego Perotti thrashed home a third after 63 minutes to move Roma on to eight points, one clear of Chelsea, who slip to second.

After the thrilling fare between the two sides at Stamford Bridge, the one-sided nature of the return, which saw Chelsea suffer their biggest defeat under Antonio Conte since their 3-0 loss at Arsenal last season, was a sign of unsettled times for the Italian.