The veteran has been pin-pointed as the understudy to Diego Milito at San Siro for the rest of the season.
"A few more details to sort out between Inter, Lazio and my client and it'll be made official," said agent Fabio Parisi.
"The negotiations are based around a 400,000 price-tag and a contract that will hold the player to Inter until June.
"In the meantime, Rocchi will return to training along with his Lazio teammates. Inter do not begin training until January 2, so there are still a few days available to us."