The transfer, confirmed by Sky Sports Deutschland and reported by Patrick Berger, follows days of speculation involving clubs such as Chelsea, Milan, Roma, and Atalanta.
Alajbegovic, who has been linked with several Serie A sides, had been priced at €35m plus bonuses — a target no other club had met until Juventus emerged with a concrete offer.
His move to Turin comes after a productive loan season at RB Salzburg, where he netted 13 goals and provided four assists in 44 games.
Atalanta had previously made the strongest bid but withdrew after it was turned down. Meanwhile, Chelsea were thought to be in advanced talks before the Bianconeri made their move. The deal may have been obscured by Juventus' reported interest in PSG's Randal Kolo Muani or their recent loan of Lois Openda to Lyon. Alajbegovic, 18, will turn 19 in September and is expected to become one of the youngest stars in the Juventus squad next season. According to reports, the initial fee for the deal is €33 million plus add-ons. Fabrizio Romano reports that Juventus have finalized a deal with Bayer Leverkusen for the Frenchman, agreeing to an initial loan with a €38M obligation to buy, plus €7M easy bonuses and €5M harder ones. Alajbegovic will pocket around €5M and will take the medicals this week. He notched 10 goals and 3 assists in 22 matches during his previous stint in Turin. Juventus offered an immediate regular role, while Chelsea had proposed a loan elsewhere. Their new director, Frederic Massara, talked frequently with his camp, which comprises Miralem Pjanic, while he was at Roma.