"No, I'm not disappointed", Guardiola told reporters ahead of City's International Champions Cup clash with Borussia Dortmund on Friday.
But one player who will be involved against Dortmund is out-of-favour goalkeeper Joe Hart.
"It would have been a mistake for him if he came and he wanted to go to Chelsea with Maurizio Sarri".
Guardiola was forced to pick a mixed team that included youngsters and a number of players that spent last season out on loan including Joe Hart, Jason Denayer and Patrick Roberts.
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Mahrez and Brahim Díaz showed some good link up play as the second half went on, but the Citizens lacked the killer edge even with the introduction of Leroy Sane with 20 minutes remaining. "In his situation, he's here and we will try to find a solution, which is best for him and if not he'll stay here".
A first-half penalty from Mario Gotze has earned Borussia Dortmund a 1-0 victory over Manchester City in their pre-season friendly in Chicago.
Following the conclusion of the tournament last Sunday, a majority of City's first-team players have yet to resume full training and Guardiola said he will not rush them back.
Defender Mendy, who made just one substitute appearance for France during their triumph at Russian Federation 2018, and Portugal midfielder Bernardo Silva are the only members of Guardiola's squad who featured in the World Cup to be included on the trip. "We had just one week or ten days together - most of the team played together for the first time".
"In some minutes, we started well". We spoke during this week and the courage, intensity and desire to play was very good. If they don't want to come it is better they don't come.