The striker signed in a €2m loan with the obligation to buy at the end of the season for another €12m.
“I am very happy and thank President Urbano Cairo and Toro, because they allowed me to achieve my dream of coming back to Italy," said the 27-year-old.
“It is what I wanted, it was my dream to return to Italy and I achieved it. Now my priority is to start work with my new teammates and give my contribution to the club."
Toro president Urbano Cairo also said: “His arrival further reinforces an attack that was already of a very high level. Along with his technical and physical qualities, he brings the enthusiasm of someone who chose Toro to come back to Italy and take on the role of a protagonist.
“In the Granata, he'll find all the conditions to achieve his potential and be welcomed to a locker room that will immediately make him feel a key figure."