Signings will be made to freshen up the group and he accepts some players may wish to move on.
He said: “Some movements we have to do for the next season, yes, because people want to leave, players want to play.
“They accept not playing for a period but when the period is long it’s normal that they want to play more. I can’t assure that to anyone so I understand completely.”
He said: “Leroy, we are one and a half years trying to sign his (new) contract. We want him. It’s like Gundogan – it’s the same case.”
Check out the video above to hear more from the Catalan boss
Pep Guardiola knows his Manchester City side’s domination of English football will count for nothing unless they win the Champions League.
City completed an unprecedented domestic treble on Saturday when they won the FA Cup with a 6-0 demolition of Watford at Wembley, adding to the Premier League and Carabao Cup they had already won.
It proved a fitting send-off for captain Vincent Kompany, who on Sunday announced he is leaving the club to become Belgian side Anderlecht’s player-manager.
Guardiola has turned City into one of the best ever English sides and they look set to dominate on home soil for some time, but their lack of success in Europe remains a black mark against them.
They were knocked out of the Champions League at the quarter-final stage by Tottenham – a team they finished 27 points ahead of in the league – and have never gone past the semi-finals.
Guardiola says this current crop has to start achieving success in Europe.
“I said before that I know we will be judged at the end on whether we win the Champions League,” he accepted.
“I know unless we do that it will not be enough.
“This comes with me. I know that. I arrive in Barcelona, we were lucky we won it two times in four years and the people expect I am something special that we have to win the Champions League and it’s still true.
“In this club, the points record and the domestic competitions is incredible, but the Champions League we don’t win quite often compared to the other ones because the teams are so good, the competition is so demanding but we want to win it.”
Worryingly for the rest of the Premier League’s top six, Guardiola is determined to improve the City side, though warned not to expect a repeat of the “once in a lifetime” treble.
“I wouldn’t be here next season unless I believed we could improve as a group,” he said.
“I know it will be difficult because people will compare and people cannot expect us to repeat the treble or four titles in one season, that is something one team does once in their lifetime.
“I’m not focused, believe me, at the start of the season thinking, ‘I have to win one title, two, three or four’, never.
“(I want to) Continue to try to play good and to arrive at the last stages of competitions, fighting, you know the players follow us to do that.
“That is what I want, that is my target for the next season, to keep this spirit, this group follow our people.”
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The 33-year-old joined the Brussels club at the age of six, and his career has now come full circle after a trophy-laden stint at City.
He announced on his Facebook page: “I choose to be grateful for the past but remain ambitious and driven for the future.
“For the next three years, I will take up the role of player-manager of Anderlecht. Belgium’s finest.
“This may come as a surprise to you. It’s the most passionate yet rational decision I’ve ever made.”
Kompany revealed that he had met with Anderlecht chairman Marc Coucke and sporting director Michael Verschueren last summer.
“I shared my thoughts and listened to their vision for the future: ambitious, courageous and determined to get back to number one,” he wrote.
“I offered my help, no strings attached, should they need it.”
Kompany says he was then offered the player-manager job in the last few weeks.
“I want to share my knowledge with the next purple generations,” he continued.
“With that, I will also put a bit of Manchester in the heart of Belgium. This is no goodbye. It’s a see you later.”