The pre-season tournament has seen some of Europe's biggest clubs battling it out across the globe, including China, the United States and Australia.
However, Nasri has yet to feature under the newly-appointed Spaniard, prompting journalists to quiz the manager over the France international's absence.
Guardiola hinted at the fact that Nasri was not in the best physical condition after missing the end of last season through injury.
However, the former Bayern boss expects to see the midfielder return to competitive action in the next few weeks.
"Last season, he was injured in the season. We want to avoid that. We want the players on the pitch to be fit," Guardiola told reporters.
"We want their weight to be in the right place where they can run 90 minutes like Fernandinho and [Aleksandar] Kolarov and the others.
"Hopefully in the next two weeks, he will be OK."
Nasri has been training with the Citizens squad during their pre-season tour of China, and was an unused substitute in the penalty shootout victory over Borussia Dortmund on Thursday.