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I have not seen anywhere that Guardiola was interested in the transfer of Messi to City. In the summer, at the end of June, he will be 36 years old, I don’t want to say that it’s time for him to end his career, but City are a young team and Guardiola focuses on young talents, so such a transfer is very unlikely.
In addition, if City wins the Premier League and the Champions League, then this will indicate that the team is already doing great, they have Haaland, who shows excellent results, so Guardiola does not have a question about finding strikers. I remember a lot of talk about him let go to Jesus, Sterling and many others, but as you can see it didn't have any negative effect on the team.
And most likely PSG will want to keep Messi in the team, if it doesn’t work out, then he will be welcome in Barcelona.
PSG will probably really hope that Messi can stay with them next season, but in my opinion so far both parties seem to have not found a solution and a final decision regarding the future of the mega star. Messi had an interest in returning to Barcelona, as well as Barcelona, but this transfer was very difficult due to Barcelona's financial situation.
Regarding the possibility of Messi going to Manchester City, it doesn't have high probability of happening. Pep Guardiola knows who Messi is and what his qualities are, but it looks like Manchester City and Pep don't need him in the team. If Messi doesn't stay at PSG, then I think Messi will back to Barcelona or to the Arab League.
The possibility for Messi to stay is PSG is very low and I'm sure Messi is trying to choose his next destination for next season because there is not a good situation for him in French and he can't play on a team where he can't be respected, even PSG is trying to find a player to replace with Messi and they don't have much hope about this player for next season.