Foden responded with a performance that belied his tender years, highlighted by an incisive run and pass that set up Sergio Aguero's opener.
It doesn't reflect well on Maurizio Sarri who could soon feel the pressure of the Blues hot seat.
Some of their lethargy going forward could be put down to the heat, which made it hard for both sides to sustain any sort of tempo. The Blues have shown good form in their pre-season friendlies thus far, as they adapt to the change in style under Maurizio Sarri.
Guardiola was left blown away by the performance of Bernardo, however, who he believes stepped up when fielded in a more central position as a result of David Silva and Kevin De Bruyne being absent from the squad.
The 30-year-old looked sharp and slotted home his second after the restart to ensure the Premier League champions started the new season with silverware. With the player already looking like a potential match-winner for Chelsea, it looks like the Premier League champions have missed out on a big fish, and the early signs could be visible on Sunday.
Chelsea FC have so far only signed Jorginho and Rob Green so far this summer as they prepare for their first campaign under Sarri. Hats off because it is not easy to play with such a short time. Looks like he could be a useful member of Sarri's Chelsea.More news: Venezuela's Maduro blames 'assassination' attempt on Colombia
Manchester City picked up where they left off last season, claiming a comprehensive 2-0 win over a disjointed Chelsea side in the Community Shield.
With the likes of Kyle Walker, John Stones and club captain, Vincent Kompany, all featuring heavily in the World Cup and with injuries to Danilo and Benjamin Mendy, we could see a makeshift defence with the likes of Jason Deneyer and maybe even Cameron Humphreys involved.
10 of Sergio Aguero's 201 goals in all competitions for Man City have come against Chelsea - only against Newcastle (14) has he scored more for the club. Callum Hudson-Odoi looked most risky for Chelsea, but the Blues missed N'Golo Kante in midfield and struggled to create opportunities in the final third of the pitch.
They will report today, and Sarri added: "It's a long way we have to work". The Hard Tackle predicts a 2-1 win for Sarri & co.to kickstart the new era for Chelsea on a strong note.
"Momentum was a time ago, it was last season". Looked for all the world to be a third City goal.
Of course, it would be wrong to read too much into a Community Shield result played in sapping conditions by players still feeling their way back to full fitness and without some first-choice team-mates. I was focused in the final, so we will just see'.