Roma star Borini forever grateful to Chelsea
He left the Blues in the summer for Parma, on a Bosman, after no new contract was agreed.
"It's easy to say now that Chelsea made a mistake in letting him go," agent Marco De Marchi told Radio Calciomercato.
"However, myself and Fabio owe a lot to Chelsea and we thank them for helping the boy to grow in his career.
"Let's just say that we are a little disappointed with the way it ended."