The flamboyant supremo described the playmaker as a "great player" but was less kind about the Italy international's club-mates, whom he accused of lacking in star quality
The 33-year-old joined the Turin giants on a free transfer from AC Milan last summer and played an instrumental role in the side's charge towards the Serie A title, while proving similarly influential for Italy, who finished runners-up at Euro 2012.
And Zamparini believes the Bianconeri are a very ordinary side without their creative spark in the midfield.
"Juventus are composed of regular players, not great phenomena," he told Radio Radio. "Pirlo is their only great player, the others are just okay."
The Rosanero face Juventus on Sunday, and Zamparini expects his attackers to make life difficult for the Serie A holders, with the likes of Josip Ilicic, Fabrizio Miccoli and Paulo Dybala currently amongst the goals.
He added: "We can put them under difficulty, especially with our strikers who are very good."