Rodwell completed his move from Everton yesterday.
Asked how long they had been tracking Rodwell for, Platt told Sky Sports News HD: "Two and a half years, when Robbie [Roberto Mancini] first came, he has had him on his radar and always liked him.
Platt admits that they have perhaps over analysed Rodwell, but has no fears he will be a big success at the Etihad Stadium.
"When you look at a player for too long - you think that could be negative or a flaw, but it doesn't take away the characteristics the boy has," he continued.
"He has great technical ability off both feet, can pass it, play in a variety of positions, and has good physique and size.
"I think there is a great deal of potential there and so does Robbie, and we looked at it and thought it is the right thing to do, the opportunity came along for us to do it this summer, at the right money business wise, and we feel that we can provide him with the platform to realise that potential which has been there for a long time.
"We have seen him a few times, we have been to have a look and the opportunity is there, we don't think he has realised his potential and we think we can give him that stage."