The 30-year-old has been in Italy since 2008, and was set to be in the newly promoted side’s squad for the new season.
However, he’ll now be playing for the Serie B outfit starting this year.
Rivas has also played for Bari, Varese, and Arezzo, the team he began his stint in Italy with.
The Argentine made 16 appearances for Hellas, scoring one goal.
