The canonization process opened in the Milan archdiocese under Cardinal Blessed Ildefonso Schuster on 1 April 1949 in an informative process that collected documentation until the process closed in 1951. His writings were all investigated and found to be in line with official doctrine thus received theological approval on 4 May 1954 while the formal introduction to the cause came on 10 July 1970 in which he was named as a Servant of God. Cardinal Giovanni Colombo oversaw an apostolic process in 1971 after which stage all documentation collected was sent to the Congregation for the Causes of Saints in Rome who validated both processes on 3 December 1971.