The 22-year-old only joined the Bianconeri last summer but went back to Genoa on loan for the 2019/20 campaign.
Juve announced: "Juventus Football Club S.p.A. announces that an agreement has been finalized with Atalanta B.C. S.p.A. for a two-season loan, until 30 June 2022, of the registration rights of the player Cristian Romero for a consideration of € 2 million to be paid during current financial year.
"The agreed consideration might be increased up to € 2 million upon achievement of certain sportive performance objectives over the two-season period.
"The agreement also provides Atalanta B.C. S.p.A. with the option right for the definitive acquisition of the player at a price of € 16 million to be paid in three financial years."