A jubilant Pep Guardiola felt Manchester City needed to be "perfect" to extend their winning run after reiterating his belief that Napoli are among the best sides in European football, having ground out a 2-1 victory on Tuesday night.
City stormed out of the traps with goals from Raheem Sterling and Gabriel Jesus inside the opening 13 minutes but Napoli wasted a gilt-edged chance to halve the deficit when Dries Mertens' penalty was saved by Ederson just before half-time.
The Brazilian goalkeeper was a towering presence in the City goal and the only time his net was breached was through Amadou Diawara's 73rd-minute spot-kick.