Therefore, teams that haven't won the championship can still participate in the Spanish Super Cup.
Such situations have occurred twice in recent years.
One time was when Real Madrid's Galaxy Battleship achieved a double victory in La Liga and the King's Cup. The Barça team, which they defeated in the King's Cup final, was given the substitute qualification and completed a comeback, securing their only trophy in three years.
The other instance will be the next one, taking place around next season's winter break.
Once again, Real Madrid won both La Liga and the King's Cup, and Atletico Madrid will play as a substitute.
In comparison, although the European Super Cup and the FIFA Club World Cup don't have explicit clauses, they can also be included.
Because the European Super Cup is contested between the Champions League champion and the Europa League champion.
