The loan deal runs for one year and includes a purchase option.
At Tottenham, where he was teammates with Dejan Kulusevski and Lucas Bergvall, Vicario played 117 games and kept 29 clean sheets.
Vicario was called up to the Italy national team for the first time in 2024 and has made five appearances since then.
At Juventus, the 29-year-old will be a teammate of Emil Holm.
