Guardiola's first season in charge at City looks set to end in under-achievement after Champions League elimination at the last-16 stage and a failure to mount a sustained Premier League title challenge.
Wednesday's unexpected defeat at Monaco in the European competition has sparked rumours of a summer squad clear-out at the Etihad Stadium.
Guardiola denies wholesale changes are necessary but has revealed he will have a strong say in the players brought in. Player recruitment has been primarily led by director of football Txiki Begiristain in recent years.
Guardiola said: "All the managers and sporting directors want to improve and get better. Even the team that wins the triple will still make changes, so a team that does not win the Champions League or gets to the final will make changes. I knew that.
"I met the big boss (owner) Sheikh Mansour in Abu Dhabi and I know the plan. We are thinking (of how) to get better.
"For players and managers, it depends on the results, but I want to be involved in that as much as possible, and to help my team to make the next step and I have more power than ever in my life as a manager.
"For me it's a big challenge and I want to deal with that."
Guardiola, speaking at a press conference, said he received a text message from chairman Khaldoon Al Mubarak after the Champions League loss and it appeared it was a supportive one.
Read the full article on eurosport.co.uk: Pep Guardiola: I have never had more power as a manager