The 27-year-old impressed in Serie A last season and caught the eye of the Bianconeri, who have the option to buy the midfielder for 6 million euros next summer.
Juventus has bolstered its midfield by completing the 1 million euro loan signing of Romulo from Serie A rival Verona.
As part of the deal, Juve has the option to make the move permanent at the end of the 2014-15 campaign for €6 million, which would be paid over the course of three years.
Verona only acquired full ownership of Romulo last month following a hugely impressive loan period with the club.MORE: Biggest summer transfers | Soccer's beautiful fans
The former Fiorentina man made 33 appearances in that spell and scored six goals, which saw him named in Italy's provisional 30-man World Cup squad, though he didn't make the final cut.
The 27-year-old will now link up with Juve as the club bids to claim a fourth consecutive Serie A title under new coach Massimiliano Allegri.
Juve has recruited extensively in the transfer window, bringing the likes of Alvaro Morata, Patrice Evra and promising former Paris Saint-Germain attacking midfielder Kingsley Coman to Turin.