Loureiro started as a professional journalist in 1992, at the Porto-based Rádio Nova. Some of his missions included special reporting during the historical Portugal: Que Futuro? national Congress, April 1994 and the 1st Portuguese/Morocco Political Summit in Rabat, Morocco, June 1994. He was also one of the radio's early morning newscasters, between 1992 and 1994. His 1993 investigation on the transfer of a renowned football player, Paulo Futre, to the Portuguese club Benfica, indirectly paid by national public TV broadcaster RTP, led to the exoneration of the latter Executive Board.
