The agent of Michele Pazienza claims the Napoli midfielder only has to pass a medical to complete a move to Juventus.
Pazienza, who joined Napoli in 2008 from Fiorentina, becomes a free agent this summer and the 28-year-old is also a reported target of Italian champions AC Milan.
But his representative, Vincenzo D'Ippolito, says that a move to Juventus will be announced in the next few days.
"The deal with Juventus is done," D'Ippolito told Corriere dello Sport. "Pazienza will undergo a medical later this week."
Pazienza made 31 league appearances for Napoli this season to help the club finish third in Serie A and qualify for the UEFA Champions League.
Juventus have already strengthened their squad with the signing of veteran midfielder Andrea Pirlo and Sampdoria's Reto Ziegler.
Both players joined the Turin outfit on a free transfer last month.