The former manager claims the club were interviewing possible replacements several months before his dismissal last May - including Pep Guardiola and Carlo Ancelotti
Mancini led City to their first top-flight title for 44 years in 2011-12, but paid with his job after losing to Wigan in the FA Cup final exactly one year later, with Manchester United winning the league crown three weeks earlier.
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"I know a lot of people in football and I found out afterwards that they were talking to three or four managers in February, March and April," he told The Sun on Sunday.
"I know they were talking to Pep Guardiola and Carlo Ancelotti - and these were the same people I sat down with for dinner before the FA Cup final.
"It was like Judas. I trusted the chairman Khaldoon al-Mubarak 100 per cent, but not those two other guys [Soriano and Begiristain] - probably he just followed them.
"Some people just don't have the courage to talk face to face - even Khaldoon did not tell me to my face what was happening.
"Instead they were working behind my back and sacked me two games before the end of the season."