The outcome of City having a record 16 players at the World Cup is that the squad Guardiola has available for the International Champions Cup in the United States is shorn of experience.
Along for the ride are numerous young players, looking to impress the two-time European Cup winning manager, as well as recently crowned World Cup victor Benjamin Mendy, whose first season in England, after joining from French champions Monaco previous year, was marred by a serious knee injury which reduced him to only eight outings. If not, he will stay here.
Claudio Bravo and Riyad Mahrez were the only recognisable senior players in the the Citizens line-up, with most of City's first team player still on holiday.
Mahrez, 27 years old, has made the move to the Etihad in a £60m deal as Guardiola looks to mould the tricky winger into the ideal player to push Raheem Sterling and Leroy Sane for their starting positions in the side.
"I was disappointed (not to sign him)", he added.
"But he is with us".
Guardiola has travelled to the United States for games against Borussia Dortmund, Liverpool and Bayern Munich with a squad made up mostly of young players as many of his regular stars are enjoying an extended break following their exploits in Russian Federation.
Chelsea already employ another former City shot-stopper, Willy Caballero, who Hart knows well.
Mahrez, who is City's only signing so far this summer following his £60million move form Leicester City, came closest to scoring with a freekick that was well saved by Dortmund keeper Marwin Hitz.
Pep Guardiola's start to his pre-season campaign ended in defeat as Borussia Dortmund captain Mario Gotze's first half penalty was enough to see off the Premier League champions Manchester City 1-0 at Soldier Field in Chicago on Friday.
Speaking after the match, Guardiola told reporters: "Despite the decision [not to renew Hart's contract] nobody can doubt Joe's quality as a goalkeeper or what he has done in the last 10 to 12 years". We try to play with it. English football received an exceptional player at the end.