It is recognized as the third most successful team in the Basque Country following Athletic Club of Bilbao and Real Sociedad de Futbol of San Sebastián. Its biggest success was in 2001 when, in the year of its debut in European competition, it reached the 2001 UEFA Cup Final, where it played against Liverpool. It was defeated 5–4 by golden goal. In 2017, the club reached the final of the Copa del Rey, losing out 3–1 to Barcelona.