"And you ask me my opinion, as a person who has huge gratitude for what Barcelona has done for me in the academy as a football player and, after, a manager who gave me absolutely everything, what I want is he finishes his career there", Guardiola said.
This comes amid increased speculation that Messi could be reunited with him at The Etihad.
"Right now he is a Barcelona player and the transfer market is in June and July".
His importance to City is underlined by the fact he has been involved in every one of their matches so far this season, starting all three in the Champions League and seven of eight in the Premier League.
The manager said, "I said about the doctor because he accused something we have done which is not true, so he has to speak with doctors about all these other things".
His contract with the Catalan club will finish after this season and can join another club on a free transfer next summer, if Barcelona fail to convince the Argentine to sign an extension. That is the only thing in our mind.
"Messi is a Barcelona player".
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"I didn't think about anywhere else, just to stay here", he said. It will be good to do what we have done the last three years, but it's hard. "The rest, I can not say anything".
City return to action following the global break at Tottenham on Saturday.
"Sergio (Aguero) is training this week and Raheem (Sterling) today was the first training with the team".
Guardiola added that midfielder Fernandinho, recently sidelined with a muscular problem, is now out after suffering a bout of gastroenteritis.
Jose Mourinho vs. Pep Guardiola: Who Is The Better Manager? "They've been exceptional for the last four or five years". "We have a lot of top players but the life of the squad is always changing".
"The challenge for us is to continue improving and evolving, and I am very excited and about helping Manchester City do that".