Comeback kid: Martin Petrov has been in great form since Mark Hughes' departure
Perhaps Mancini's biggest success to date is transforming the Bulgarian flyer from a sulky bystander who started only three games in five months under Hughes into one of the Premier League's most in-form attackers.
'Everything's different for me now,' admits Petrov, who will be 31 on Friday, as he prepared for tomorrow's game with Blackburn.
'I was frustrated with Mark Hughes as the manager and maybe I didn't handle it very well. For the first time in my life I'd play well then get left out of the team.
'I would sometimes go home and tell my wife we would have to leave. We were happy as a family in Manchester but my situation was not good at work.
'I was not getting a chance to play when I deserved to. Mark Hughes never explained why.
'If the manager had not changed, I might have left in January. But in football things can change in one day.
'We have three wins under Mancini with three clean sheets and I've played in all the matches so far.'