Soriano hints Mancini simply wasn't the right fit for what they're now planning at City.
"Itâ€™s always hard as nobody wants to change a manager but we all want to play good football and we all want to win," said Soriano.
â€˜Roberto Mancini did very good for the club. He changed the mentality to that of a winning club and that is very hard. We thank him.
"But we are now looking for several things. We are looking to play good football and to win and I said that in the right order. If you play good football you will win. We want to play better.
"You can win one year playing not so good football and being lucky and having two extraordinary players but thatâ€™s not sustainable. You canâ€™t go to the market every year and buy the most expensive players."