Athletic Bilbao B
Bilbao Athletic, officially named Athletic Club "B", is the reserve team of Athletic Bilbao, a football club based in Bilbao, in the autonomous community of Basque Country. The team will play in the Segunda División B in the 2018–19 season. Founded in 1964, the team holds home matches at the small stadium attached to the club's training facility at Lezama, or occasionally at San Mamés Stadium, with its 53,500-seat capacity, for important fixtures.
Real Madrid CF
Athletic Bilbao, who operate a policy of only using local players, have long since ceased to be a competitive rival to clubs such as Real Madrid who scour the globe for the best talent; the "Lions" have collected no major trophies since 1984 and won only two of the 26 matches between the teams from 2005–06 to 2016–17. However, the matches remain keenly fought due to their historical and cultural significance, with some parallels to the political aspect of the Barcelona/Catalonia rivalry as Athletic are the largest club in the Basque region.