The £43m summer capture from Monaco is likely to be among the substitutes for City's Premier League opener at newly-promoted Brighton, having returned from holiday just ten days ago.
Midfielder Bernardo got a 30-minute run out in the recent friendly victory over West Ham United but was earlier this week handed a tailored training programme by City's conditioning team.
City skipper Vincent Kompany, however, is convinced the 23-year-old will become a pivotal player in Pep Guardiola's squad once he reaps the benefits of his new training regime.
The Belgium international defender said: "You can see what qualities he has (Bernardo).
"He's got a silky touch, he is a player who knows how to make key passes and I'm obviously very excited because I know how these kind of players can decide games and help you towards achieving great things.
"But he's a little bit behind on his fitness probably, which is normal and we'll need him at the right time."