The Italian champions have acquired the rights of the promising youngster, but have immediately sent him out on loan to his former team
The 21-year-old came through the ranks of the Genoa youth academy and made his official Serie A debut in August 2013.
He made 16 league appearances last term, scoring once the process, thus earning himself a move to the reigning Italian champions.
"Juventus announce that the agreement with Genoa for the definitive acquisition of the registration rights of the player Stefano Sturaro has been finalised," an official Juventus statement reads.
"The contract envisages the payment by Juventus of €5.5 million in three years. The purchase value may increase by a further maximum of €3.5m on achieving given sports performances in the course of the duration of the contract from 2015-2016 football season. Juventus and the player have signed a five-year contract of employment.
"At the same time, for 2014-2015 Juventus have reached an agreement with Genoa for the free temporary disposal of the registration rights of the same player."