Latest: Sporting 0 Chelsea 0
Chelsea made a lively start and dominated the early stages of their second Champions League game but failed to take a number of chances.
Diego Costa, who started despite ongoing concerns about a hamstring injury, was denied an opener inside two minutes by a brilliant Rui Patricio block.
And the Sporting Lisbon goalkeeper made a fine save to thwart Andre Schurrle, who also missed a glorious chance after being teed up by the excellent Eden Hazard.
Filipe Luis started for the Blues, who left Willian and Cesar Azpilicueta on the bench.
Chelsea (4-2-3-1): Courtois; Ivanovic, Cahill, Terry, Filipe Luis; Matic, Fabregas; Schurrle, Oscar, Hazard; Diego Costa
Subs: Cech, Azpilicueta, Zouma, Mikel, Salah, Willian, Remy.
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