Mancini "invaded" the pitch to angrily confront referee Peter Rasmussen following the midweek draw with Ajax, which put City perilously close to elimination.
And changes in the boardroom hierarchy have left fans wondering whether the Abu Dhabi sands are shifting beneath his feet. But Platt maintains Mancini would handle the pressure.
"No. It's not getting to him because I know him. He has the desire to win," the Daily Star quoted Mancini, as saying.
"He's signed a five-year contract in the summer which was given to him by the club by virtue of the fact that he's the manager of the league champions. I can look at the league table and the last time I did we were two points off the top in third place after ten games with 84 points to play for so it's hardly a crisis," he added.
It comes after Barcelona old boys Ferran Soriano and Txiki Begiristain have been appointed chief executive and sporting director respectively with former Nou Camp boss Pep Guardiola lurking in the shadows.
But Platt says Mancini is not worrying about his job at City.
"The new chief executive was needed and I would say Ferran is a very, very good appointment. You have got someone at the helm who Roberto is very content with," he said.
"They have a very solid relationship and, if his arrival means a new sporting director comes in, I don't see it as a problem," he added. (ANI )