However, Italy global Jorginho followed Maurizio Sarri to Sunday's Community Shield opponents Chelsea, and Guardiola is ready to give a chance to 20-year-old Brazilian Luiz, who joined from Vasco da Gama in a £10 million move last summer.
Manchester United manager Jose Mourinho has been urged to smile more by one of the club's former players.
I'm happy that a manager of that level is here in the Premier League.
"Gabriel has improved a lot since he came", the City boss said.
Sarri will speak to them before the FA Community Shield on Sunday and the task of closing the gap on runaway champions City and his good friend Pep Guardiola. He is perfectly suited to the style of football that Guardiola has instilled at City, so it should come as no surprise that City have secured his long term future at the Etihad.
'Pep is a friend, so I respect him as a person, ' said Sarri. "He had some problems in the first season, but he said that football is football everywhere". He cites their half-time formation change against Arsenal back in 2016 - the switch that ultimately led to the Premier League title - as an example of their tactical flexibility.
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The approach known as "Sarri-ball" will grace Stamford Bridge this season as the Blues move away from a mainly defensive outlook.
The Community Shield is always a tricky contest to call due to its friendly feel despite an honour being on offer - though not many count it as a trophy.
"Yes, we were close, but in the end Jorginho chose to stay with Sarri", Guardiola said. 'It is hard because Manchester City have been working together for two years. We started two and a half weeks ago.
'I look forward to playing in Wembley.
"The team already in a short time plays like he wants", the City boss said.
Willian, having reported five days later for pre-season training citing a problem with his passport, has escaped a club fine and left the new manager with the impression he will be here for the season despite interest from Real Madrid. I spoke about positions and characteristics but no names, ' Sarri told reporters.