A close friend of General José Moscardó, he had been a serving officer on the side of the Nationalists during the Spanish Civil War and was appointed club president on the basis of his loyalty to Francoist Spain.
Piñeyro made his inaugural speech to his fellow FC Barcelona board members on 13 March 1940 and outlined his intentions to depoliticise the club off the field, while at the same time aiming for sporting greatness on it.
Barça, with a team coached by Joan Josep Nogués, had struggled in La Liga and narrowly avoided being relegated after winning a play-off against Real Murcia.
During the 1942–1943 season Barça finished third in La Liga and reached the Copa del Generalísimo semi-final where they played Real Madrid.
Piñeyro subsequently lodged a complaint with the Royal Spanish Football Federation and resigned as club president permanently on 20 August 1943.