Reference

For the 2020–21 season, the Royal Spanish Football Federation (RFEF) introduced several significant changes:

1. Five Substitutions Rule: La Liga allowed teams to make five substitutions per match, up from the traditional three. This was a change implemented as a response to the COVID-19 pandemic to reduce the physical load on players due to condensed schedules source.

2. Revisions in League Structure: The Tercera División was repositioned to the fifth level, and the Segunda División B became the fourth level, with Tercera and Segunda B suffixing the federation's Spanish initials "RFEF" to its official title source.

3. Potential Expansion of Segunda Division: There was a proposal to expand the Segunda Division to 24 teams for that season. This change was considered to accommodate disruptions caused by the pandemic, ensuring a fairer competition format by allowing more teams to compete source.

These adjustments were part of broader efforts to manage the impacts of the COVID-19 pandemic and ensure competitive balance within Spanish football leagues.