Despite signing midfielder Jorginho from Hellas Verona, the Azzurri are determined to add at least two more players to their ranks before the end of the week.
According to La Gazzetta dello Sport, Corinthians midfielder Ralf is one of the first names on their hit-list.
The 29-year-old is widely tipped to move to Europe in January, but the problem is the Brazilian giants are not prepared to sell him on the cheap.
At the same time, the Azzurri are working on the signing Palmeiras defender Henrique, who is supposed to provide back-up for starting defensive pairing of Miguel Britos and Raul Albiol.
Napoli are hoping to sign the former Barcelona defender on loan until the end of the season, but the Brazilian club are only interested in an 18-month loan deal.