Sergio Aguero will still not be guaranteed a starting spot despite extending his Manchester City contract, according to Pep Guardiola.
City announced on Friday that the club's all-time leading goalscorer Aguero agreed to add another year to his deal, tying him to the club until June 2021.
The 30-year-old established himself as one of the Premier League's top strikers following his arrival from Atletico Madrid in 2011, but Guardiola demanded he do more work for the team shortly after taking over two years ago.
Gabriel Jesus joining from Palmeiras provided Aguero with serious competition, and the Catalan will continue to have no qualms about taking the Argentine out of his line-up when he believes it is required.
Asked if he ever worried Aguero would leave City, Guardiola told a news conference: "Never. You all asked me many times, especially in the first year when we didn't win, and sometimes he didn't play, 'What's the problem with Sergio?'
"I understand when you take that decision - it happened in Barcelona many times - I always know the reaction [will be bad] when the result is not good, but I have to take decisions.
"But the relationship [with Aguero] was always top, was perfect, and I'm delighted he can continue playing here.
"Always when he didn't play few, few, few times it's because I believed Gabriel could play, or play with a false nine or whatever. That is going to happen the next three years.
"Now he knows me better, I know him better, like a football player, like a human being, and that is the most important thing."
After a disappointing World Cup with Brazil, Jesus has just one City goal to his name this season and was replaced by Aguero after 63 minutes in their surprise 2-1 Champions League defeat to Lyon on Wednesday.
Guardiola pointed out the 21-year-old still has a lot to learn and feels he and the team as a whole can emulate the best athletes and teams in sport by responding to their recent adversities positively.
"His first high pressing is the best in the world but he's still a young player and they have gaps to improve," said Guardiola.
"We are going to help in the final third, in taking decisions, in the short spaces, but the most important thing from Gabriel is the desire to improve and always he's paying attention in training sessions to know what he can improve and he will get it.
"I was not there [the World Cup] so I can't speak about that, but they are young and that is a challenge.
"In a good moment you have to be stable, in the bad moments you have to be 'OK, I am here again.' You have to learn [from] the best athletes in the world, always they have a new challenge … you have to face it. You have to learn from that and improve.
"When we analyse how good we are it's always the past, it's never what [just] happened. The game is over and the day after you never know what's going to happen.
"The most nice thing and the reason I like to be here again and again is now it's a new challenge. After what we have done it's a new challenge.
"The contenders are better, Europe every time is better and we're going to see if we can handle that situation. If done, OK, improve with that."