The Italian, who won the Barclays Premier League title just a year ago, knows his time is up at the Etihad Stadium after the club decided to replace him with Malaga coach Manuel Pellegrini.
However, although he has accepted his fate, Mancini is angry with the way the business has been handled since reports of a deal with Pellegrini leaked in Spain on Friday night.
He cannot understand why no-one from the club has told him his time is up. He is marooned in London with the City squad and had dinner with his coaching staff last night, having stayed in the south after Saturday's dismal FA Cup final defeat by Wigan.
It is understood that Mancini would have been sacked even if City had won at Wembley after a deal was struck with 59-year-old Pellegrini. He will now be officially told once everything has been rubber-stamped with City chairman Khaldoon Al Mubarak and owner Sheik Mansour.