The Italy international shone at Euro 2012, most notably delivering a match-winning performance against Germany in the semi-final, and has long been linked with a move back to his home country.
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But Raiola has ruled out any imminent departure and claimed that City's owners are keen to reap the rewards of the player's popularity.
"Unsellable before; now untouchable," he told Sky Sport Italia. "The sheikhs [at Man City] are completely convinced in the Balo brand; he should become one of the strongest players in the world."
Raiola revealed that only minor details, meanwhile, stand in the way of AC Milan forward Zlatan Ibrahimovic completing his move to Paris Saint-Germain, but warned that his client will not sign on the dotted line unless he is 100 per cent satisfied with his contract offer.
The Rossoneri have already agreed to sell the Sweden international to the Ligue 1 outfit, but the 30-year-old is yet to agree personal terms with the Qatari-owned club.
"We are lacking details, but the details are important," Raiola insisted. "How many millions? I did not go to school; I do not know how to count.
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"There are various discussions; it is a major contract. If Ibra does not want to leave, he will not sign. There are these great moments and opportunities and if all goes well, good; if it does not go well, no matter.
"But we are here to do things well. PSG are a team that will be among the best in a few years, if they are not already."