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Manchester City's performance has been kind of poor, but that doesn’t mean they are going to sack Guardiola. He has really achieved a lot for Manchester City, so just because his performance is bad this season doesn’t mean he will be sacked, so we shouldn’t even expect Guardiola to be sacked only if he wants to leave the club.
It is an interesting question how strong Guardiola's position is. On the one hand, his achievements in the Premier League are undeniable, but in the Champions League, despite astronomical investments, he was able to win only one title. In fact, he did not achieve anything special (let's not forget the League v. City case). With the latest results his image is steadily deteriorating and if City don't get out of the crisis this season I think they will start looking for a replacement for him.