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 next summer
Juventus have bolstered their midfield by completing the €1 million loan signing of Romulo from Serie A rivals Verona.
As part of the deal, Juve have the option to make the move permanent at the end of the 2014-15 campaign for €6million, 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.
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 they bid to claim a fourth consecutive Serie A title under new coach Massimiliano Allegri.
Juve have 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.