 He then served as vice-rector of the theological seminary and bursar of the general diocesan seminary in Novara until 1946.After a period of pastoral work from 1946 to 1951, Poletti was made Pro-Vicar General of Novara in 1954, and on 16 June 1955 a Protonotary Apostolic.On 12 July 1958, Poletti was appointed Auxiliary Bishop of Novara and Titular Bishop of Medeli.