Guardiola revealed that Nasri is still searching for a new club following his side's 3-0 win over Tottenham in the Nissan Stadium in Nashville.
Youngster Tosin Adarabioyo signed a new City contract earlier this summer, but does not appear to be in the Spaniard's plans for the new season, leaving Nicolas Otamendi, Vincent Kompany and John Stones as the only senior options. We wanted to keep [Nasri] last pre-season but he chose to go to Sevilla and I like to work with the guys who want to work with us.
Nasri spent last season on-loan at Sevilla and has been told he has no future under Guardiola.
Spurs' only win in the competition came against Paris St-Germain, with Saturday's defeat adding to a loss against Roma.
City opened the scoring in Tennessee when Kevin De Bruyne's free-kick flicked off the Tottenham wall and fell to the feet of centre-back Stones, who made no mistake from close range. We've played tough games in America in testing conditions and the most important thing is to train and get fit.
"We chose to make the squad younger and we tried to get the best full-backs possible". "We spread out the opponents and we can have more space in the middle".
Guardiola has signed six players already this summer and further changes to his squad are expected before the 31 August transfer deadline.
Players will leave, too.
Guardiola says the Nigerian may be on his way out of the club but if the move fails to materialise, he will be "part of the group" next season. He has his own special quality.