From Frassatiusa.org:
Although many miracles may perhaps be attributed to the intercession of Saint Frassati, the Church officially recognized the healing of Domenico Sellan in 1933. At the time, Domenico was 40 years old and suffering from a tubercular disease of the spine, paralyzed and nearing death. A priest visited him on December 28, 1933, and brought him a small prayer card of Pier Giorgio (whose cause for canonization was opened soon after his death.) Domenico was miraculously cured and lived another 35 years.
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From National Catholic Register:
Father Juan Manuel Gutiérrez is a Mexican priest who now serves in the Archdiocese of Los Angeles, the largest and probably the most diverse in the United States. His name is now forever linked to the young Italian Blessed Pier Giorgio Frassati, who died at the age of 24 and who next year, during the 2025 Jubilee, will be declared a saint thanks to the miracle the 38-year-old priest experienced through his intercession.
On Nov. 25, Pope Francis approved the decree of the miracle Father Gutiérrez received through the intercession of Frassati.