On 15 April 1950, he was ordained a deacon by Metropolitan Gregory (Chukov) of Leningrad, and on 17 April 1950, he was ordained a priest and appointed rector of the Theophany church in city of Jõhvi, Estonia, in the Tallinn Diocese. On 15 July 1957, Fr. Alexiy was appointed Rector of the Cathedral of the Dormition in Tallinn and Dean of the Tartu district. He was elevated to the rank of Archpriest on 17 August 1958, and on 30 March 1959 he was appointed Dean of the united Tartu-Viljandi deanery of the Tallinn diocese. On 3 March 1961 he was tonsured a monk in the Trinity Cathedral of the Trinity Lavra of St. Sergius.