It was also the first empty campaign for Manchester City since the 2012-2013 season.
"Hopefully next season I will be here and we will not spend how we spent this season", Guardiola told reporters ahead of City's Premier League opener at Brighton on Saturday.
City has spent about 200 million pounds ($260 million) this offseason, mostly on full backs Kyle Walker, Benjamin Mendy and Danilo, to follow on from about 170 million ($207 million) last summer. I assure you that. We bought three and the market is so demanding not just for Manchester City. In the next three or four years Manchester City will buy one, two, maybe three players.
"We needed to do that this summer because we have one of the oldest teams in Europe".
Guardiola said the current spike in football transfer spending, which culminated in Neymar's recent world record move from Barcelona to Paris Saint-Germain for €222m, had been building for some time.
"We have spent, yes, but all the teams - with the exception of Tottenham - have spent", Guardiola said. The arrival of 11 "important" players - as Guardiola refers to them - has handed the Spanish coach an embarrassment of riches up in attack and fresh energy throughout his squad, which now has an average age of 24.
"We did it earlier, so we were lucky because now it would be so much more expensive with what has happened in the last weeks".
"The club was clever like that because we anticipated what we needed after last season".
Guardiola believes the Neymar deal has over-inflated the market to levels that can not be maintained.
"But it is going to finish, it is unsustainable". Brighton will be making its Premier League debut after earning its spot with a 93-point performance in the EFL Championship last season.
"My experience of being a manager, always the beginning of the season the new ones are the toughest ones", Guardiola added.
"We spoke and I saw last season how tough is this league". We've got a very level-headed group of professionals that have trained well every week and have applied themselves very well for games.