Leroy Sane insists Manchester City have room for improvement despite Saturday's comprehensive 4-0 win at West Ham.
The Premier League champions extended the unbeaten start to their title defence to 13 matches as Germany winger Sane hit a brace, following early strikes from David Silva and Raheem Sterling.
West Ham, under former City boss Manuel Pellegrini, posed questions of their opponents throughout and Sane felt Pep Guardiola's side should not have made such heavy work of their eighth league clean sheet this season.
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"We played a really good game going forward, also defensively," said Sane.