Why Spain's reserve football teams compete in the same league pyramid as senior clubs

Countries & Cities · Published 15 October 2026 Swipe more like this →

In short: In Spain, reserve squads like Real Sociedad B are not confined to a separate league. Instead, they climb the same professional ladder as their parent clubs. This unique structure forces these teams to navigate complex promotion rules, ensuring they never clash with their own senior counterparts on the pitch.

Real Sociedad B, affectionately known as Sanse or the Potrillos—a nod to the nearby horse racetrack at their Zubieta training grounds—was founded in 1955. The club emerged from a desire to bridge the gap between talented youth players and the senior squad. Initially dubbed Real Sociedad de Fútbol Junior, the team quickly ascended the ranks. By 1959, they reached the second division, though their progress was often tethered to the fortunes of the main team. Because Spanish regulations prohibit reserve teams from competing in the same division as their parent club, Sanse has occasionally been denied promotion or relegated simply because the senior team occupied a specific tier.

The team's identity has shifted over the decades due to evolving professional requirements. In 1991, league rules mandated that B teams must share the name of their parent club, leading to the current designation. This integration into the national pyramid is a defining feature of Spanish football, contrasting sharply with systems in other nations where reserve teams play in isolated leagues. The club serves as a vital incubator, having prepared the majority of the squad that secured consecutive Spanish championships for Real Sociedad in the early 1980s.

Modern operations are highly structured. Since 2016, the club has utilized a subsidiary, Real Sociedad C, to feed talent into the B team. The hierarchy is strict: the C team must remain at least one division below the B squad. While Sanse has seen success, including a promotion to the second division in 2021 after a 59-year absence, the nature of reserve football remains transient. Relegated back to the third tier in 2022, the team continues its primary mission: developing players within the Zubieta facilities to eventually represent the first team in La Liga.

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