As Platt spoke to the media, Mancini spent his time pacing up and down the tunnel outside City's dressing room before leaning against a wall.
"It's tense, the stakes are high and you live that game for 90 minutes," said Platt, trying to soothe over Mancini's no-show. "Immediately afterwards you are expected to come out, have a cool head and speak because if you don't, you get into all sorts of mither."
He added: "There is an appreciation of Roberto from the supporters and the owners. The expectancy levels of Roberto Mancini are a lot higher than what people think. If people want to talk about rumours and negatives that is up to them. We can't stop that.
"If people want to do things like that, they can. All I know is that during his career he has won things. That is what his focus, desire and intensity is about. He won't want stop wanting to win things. He will regroup from this and by the time we play Newcastle he will have 100% focus."