Athletic Club, commonly known as just Athletic domestically and often as Athletic Bilbao abroad, is a professional football club based in the city of Bilbao in the Basque Country, Spain. They are known as Los Leones because their stadium was built near a church called San Mamés, which was named after Saint Mammes, an early Christian thrown to the lions by the Romans. Mammes pacified the lions and was later made a saint. The team plays its home matches at the San Mamés Stadium. Its home colours are red and white-striped shirts with black shorts.

Real Sociedad de Fútbol, more commonly referred to as Real Sociedad in English, Erreala or Reala in Basque, La Real in Spanish, is a Spanish professional sports club in the city of Donostia-San Sebastián, Basque Country, founded on 7 September 1909. It plays its home matches at the Anoeta Stadium.