Betis Deportivo Balompié enter the Copa del Rey. Additionally, only under-23 players or under-25 players with a professional contract can switch between senior and reserve teams. Founded in 1963 as "Triana Balompié" and named after a working class district in Seville. Legend has it that Betis, later to evolve into Real Betis, was formed in 1913 by a group of Sevilla FC directors after the club refused to sign a player who came from Triana. In 1976, the team was renamed as "Betis Deportivo" and started to compile an impressive record in the Spanish U-19 Cup, winning the competition in 1983, 1990, 1998
Real Sociedad B División with under-20 graduates of the club's youth system. The Real Sociedad C team must play at least one division below Sanse. Real Sociedad B hold home games at "Instalaciones de Zubieta", which holds 2,500 spectators. Players of both the first and the second teams train in these facilities, with Sanse’s players being nicknamed "Potrillos" ("Colts") as the grounds are located near the city's horse racetrack. Real Sociedad B Real Sociedad de Fútbol B (also known as Sanse) is a Spanish football team based in San Sebastián, in the autonomous community of Basque Country. Founded in 1951, it is the