On 4 September 1960, Herrera netted the fourth goal in a 5–1 defeat of C.A. Peñarol in the Intercontinental Cup (also the aggregate score). Shortly after, however, he was deemed surplus to requirements at Real Madrid and, in January 1962, was loaned to fellow La Liga side Real Sociedad until the end of the campaign, which ended in relegation for the Basques.