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Looks like Guendongan is still in the negotiation stage, because it is rumored that he will leave City, Pep is still taking a more approach to maintaining Guendong, however he is a player who made a big contribution to the glory of Manchester City last season.
If the player you are referring to is Ilkay Gundogan, then you have made a big mistake. Ilkay Gundogan has become an official Barcelona player, it was announced some time ago since Barcelona managed to sign him for free. I agree that Ilkay Gundogan has contributed greatly to Manchester City's title success over the last few seasons, but unfortunately Manchester City did not manage to extend his contract so Barcelona stepped forward as the next port of Ilkay's career.
Sorry, it seems like I read information that was somewhat stale yesterday, so sorry for the mistakes, and in fact it was true that the Gundongan had entered and rushed with the Barcelona squad under the Xavi coach, maybe to fill the emptiness positioned by Gundongan, Pep could play Mateo Kovacic or Phil Forden, although Phil Foden previously played under the Gundongan but Phil himself was suitable to fill the position left by the Gundongan.
Maybe it is true that Mahrez could leave the city, because he receives an offer from Saudi Arabia, including maybe Bernardo Silva who continues to be targeted by PSG to this day, PSG really wants him to be able to join them in the French league, indeed these players are quite good and we know how they have a big contribution very good with Manchester City, even though today Pep has new players like Kovacic and Gvardiol, Pep has to turn his head because there is quite a lot to prepare, even though he is still the favorite team, but that will change if another team is able to beat Manchester City with dominate it.
All players will leave at some time, regardless of whether they retire or move to another team. Bernardo Silva and Mahrez are likely to move in the near future, but I think Silva will still be around for the next 1-2 seasons.
Of course Manchester City will find replacements for the players who have left, but this will only be done in a phased manner. So far Manchester City have been very good in terms of player transfers, that is part of the reason why they have players with good quality.
Yes all players have a chance to go and retire, Mahrez has been declared moved and we are waiting for Bernardo Silva who has the opportunity to leave Manchester City as well, but I think he will discourage this season to leave Manchester City, I hope his intention is not done and survive at Manchester City.
Pep did a strategy on the Tranfers Exchange with a good systematic so that he was not in a hurry and walked according to plan, he always had A and B and so on to anticipate if there were players who wanted to get out of Manchester City.