He left Juventus this summer in an effort to play with greater regularity after a year on the sidelines.
Giovinco told Domenica Sportiva: "I didn't leave Juve when Diego arrived because I wanted to play all my cards right.
"In fact, last year I played the first six games with Ferrara and good results arrived.
"But after a certain point I didn't get on the pitch anymore. I don't know why."