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.
The former Napoli midfielder looked to be on his way to City, but a last-minute approach from Chelsea changed his mind.
He said: "We will decide on them at the end of pre-season". "English football has signed an exceptional player". "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".
The Algeria star showed glimpses of his quality for the Premier League champions and he nearly scored before half-time via a set-piece but undermanned City fell to Dortmund at Soldier Field.
"I know it is not easy for him what happened in the last period, but he's with us and tomorrow he's going to play".
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Since Guardiola arrived at City as boss in the summer of 2016, Hart has had season-long loan spells with Torino and West Ham.
The 26-year-old added: "Since I was little I was someone who always enjoyed challenges".
The majority of Guardiola's squad are on holiday after their World Cup exploits but new signing Riyad Mahrez made his first appearance for the club against the Germans in a youthful lineup.
Promising youngsters Phil Foden and Brahim Diaz are amongst the huge number of academy players in Guardiola's squad.
City play Chelsea in the Community Shield on 5 August before opening their league campaign at Arsenal a week later. These players are Premier League players but need the right development and are fighting against some of the best players ion the planet for games, it doesn't work like that and loans are the name of the game.