In April 1928, José María Acha, a director at Arenas de Getxo, first proposed the idea of a national league in Spain. After much debate about the size of the league and who would take part, the Real Federación Española de Fútbol eventually agreed on the ten teams who would form the first Primera División in 1929. Arenas, Barcelona, Real Madrid, Athletic Bilbao, Real Sociedad and Real Unión were all selected as previous winners of the Copa del Rey. Atlético Madrid, Espanyol and Europa qualified as Copa del Rey runners-up and Racing de Santander qualified through a knockout competition. Only three of the founding clubs (Real Madrid, Barcelona, and Athletic Bilbao) have never been relegated from the Primera División.