Fr Devlin was Ordained to the Priesthood in Our Lady of Good Aid Cathedral, Motherwell on 8th March 1985. On Sunday 7th March 2010 a Mass of Thanksgiving was held in the Universary College Chapel to celebrate the 25th Anniversary of his Ordination; celebrants who attended the Mass and Silver Jubilee included Cardinal O’Brien, Bishop O’Donoghue and St Mary's Chair of Governors Bishop Stack.