De Bruyne, who joined City from Wolfsburg in 2015, signed a six-year deal at The Etihad in January.
He has certainly started this season with a bang as City look to become the first team to defend the Premier League title in nearly a decade.
Manchester City have become only the second English club, after neighbours United, to announce revenues of more than £500 million having broken the barrier following their record-breaking title season.
"When Jorge Valdano (interviewer) asked me about selling (De Bruyne) for £250 million, I say no, but it's my personal opinion".
The club's facilities have also been transformed with state-of-the-art training facilities.
Super Typhoon Mangkhut makes landfall in the Philippines
Storm warnings have been raised in 25 provinces across the main northern island of Luzon, restricting sea and air travel. The deadliest storm on record in the Philippines is Super Typhoon Haiyan, which also sparked category four alerts.
"You learn languages, cultures, to travel and see other places is nice, also for the family", Guardiola said.
"I don't know about the salaries or the wages, it's the business of the club", Guardiola said. "He knows absolutely everything, what happened here, the team, the way we play, or what happens with the club - he's involved". I expect we will be successful and spend less next season. Sometimes these kind of thing needs their own time.
But his Man City teammates have started the season in strong form, winning three of their first four games and remaining unbeaten ahead of their match against newly-promoted Fulham on Saturday afternoon.
'(Leeds boss) Marcelo Bielsa told me he was his favourite player. "In football mistakes exist but I really care about our quantity of mistakes", the Serbian manager added. "That is why you will continue to see us strive to recruit the very best talent into this club and its sister organisations in all functions and at all levels".