Mancini suffered a much-publicised falling-out with Tevez in September 2011 during a UEFA Champions League tie at Bayern Munich.
The spat saw Tevez spend several months in self-imposed exile back in Argentina, before returning to help City to the Premier League title.
Mancini claimed at the time of the incident that he considered the South American to be 'finished' at City, but relaxed that stance to welcome the striker back into his plans.
Having left City at the end of last season, he now claims that the issue was blown out of proportion and believes Tevez will prove to be a shrewd acquisition for reigning Serie A champions Juventus.
Mancini told Tuttosport: "He's the type of player who has been missing at Juventus, one who allows the team to take a quality jump.
"It's never easy winning, but I think Antonio Conte has the team to win a third consecutive Scudetto."
On Tevez, he added: "In three-and-a-half years together he never gave me any trouble.
"My quarrel with him? There was a momentary outburst, and maybe at that time Carlos was thinking about leaving the club, but after that there were no similar episodes.
"Conte won't have a problem managing him because Carlos is a model professional."