The Italian coach achieved the impossible last season by leading Leicester to a historic Premier League title.
But Ranieri was brought back down to earth this season with the Foxes battling with relegation.
And last month, with Leicester one point above the relegation zone, Leicester took the shock decision to sack the much-adored manager.
Many pundits criticised Leicester's owners for a lack of loyalty, but Ranieri has kept quiet since releasing a statement after his dismissal.
Claudio Ranieri admits he was shocked to be sacked by Leicester
But the 65-year-old has opened up to inmates at the Rebibbia prison in Rome about how he really felt about the news.
“Thinking of the dismissal by Leicester, the first thing that comes to mind is a sense of surprise even more than of bitterness,” said Ranieri.
“I had gone through a lot in my long career, but I’d never experienced anything like that. It was a shock.
"Even though, at the end of the day, these things happen in football.
Claudio Ranieri leaves Leicester City for the last time after sacking
Fri, February 24, 2017
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“This is my world. I started coaching in the Interregionale league in Catanzaro.
"There were pitches with no grass, at times we had no water, no training equipment. I had to do it all myself.
“I never hitched my wagon to anyone, so what I achieved over the years was done with only my results on the field.”
Ranieri led Leicester to a historic Premier League title last season
And Ranieri is likely to give more details about his dismissal from Leicester when he appears on Sky Sports' Monday Night Football next month.
"Sky in England asked me to be an announcer during a game on April 10th and I agreed, until that day comes I don't want to talk," Ranieri added.
"Everything started in England and it's right to start over in England."