Striker Michy Batshuayi scored twice to edge Chelsea past a spirited Bristol Rovers and into EFL Cup round three.
The £33m summer signing from Marseille volleyed in, and Victor Moses struck from close range two minutes later.
Peter Hartley halved the lead by heading in a free-kick before Batshuayi restored the hosts’ two-goal cushion.
Ellis Harrison scored a second-half penalty and struck the crossbar for League One Rovers, but Chelsea kept their cool to progress.
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