The 28-year-old attacking midfielder has signed a four-year deal at the Stadium of Light following the move, which the Turin giants said was for €7.5m.
Giaccherini has 14 caps for the Azzurri and featured both at Euro 2012 – where Cesare Prandelli’s men finished as runners-up – and the recent Confederations Cup in Brazil.
He won successive Scudettos with Juve in the past two seasons, making 40 appearances and scoring four goals, after joining from Cesena, where he played for seven years.
Originally signed on a co-ownership for €3m (£2.6m), Juve paid a further €4.25m (£3.7m) a year later to net him outright.
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