In January 2014, Fiorillo was involved in a co-ownership player-exchange deal with 50% of his contract being sold to reigning Serie A champions, Juventus in exchange for 50% of the contractual rights of Juventus' Stefano Beltrame. Both 50% rights were valued for €2 million. As part of the deal, Fiorillo remained with Sampdoria on a six-month temporary loan deal, and Beltrame returned to Bari, with whom he was previously on loan with from Juventus. On 19 June 2014, Juventus and Sampdoria renewed the co-ownership agreement of the player, with Juventus holding the registration rights of the goalkeeper. On 30 June 2014, Fiorillo moved to Juventus upon the expiration of the loan agreement.