City have now lost only one away game in the league - at Liverpool - of their last 21.
Seconds later, City had scored again, Bernardo producing a spectacular first-time left-footed finish that flew into the top corner in emphatic fashion.
The head coach, who has replaced Arsène Wenger after 22 years at the helm, has said that Laurent Koscielny is club captain but with the France defender recovering from a long-term achilles injury, four others have been named as part of his leadership group.
But on the evidence of this game, City look ready to break that trend. The 2-0 loss actually flattered Chelsea; it could have been by a margin of at least five goals. Arsenal are likely to welcome another debutant, the feisty but creative Lucas Torreira, in their deepest role.
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It doesn't get much easier for Arsenal as they travel to Stamford Bridge next Saturday, while City play host to Huddersfield the following day.
Speaking at a news conference ahead of Arsenal clash with Man City this Sunday, Emery was quoted by the Sportreview, saying of the Ramsey situation: "That's not my work".
Pep Guardiola's men were a class apart in the Premier League last season, amassing 100 points and 106 goals, both new top flight records, and played some of the finest football the league had ever seen.
Bernd Leno is expected to be preferred in goal to Petr Cech, with Shkodran Mustafi and Sokratis the centre-back pairing.
For Arsenal, their biggest concern will be at left-back with two specialist players in that position out for the fixture.
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Arsenal are an unknown quantity going into the new campaign, something which should excite and also intrigue fans.
Problems continued after the break, when newcomer Matteo Guendouzi misjudged an aerial ball on the halfway line, which allowed Aguero a one-on-one chance.
The champions also showed signs they are motivated to successfully defend their league crown with that comprehensive 2-0 win over Chelsea in the Community Shield.
Arsenal played City three times last season and lost all games with a 9-1 aggregate scoreline.
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