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.
Athletic Bilbao signing policy
Back in 1911, a dispute occurred between Real Sociedad and Athletic Bilbao regarding the latter fielding ineligible English players in the 1911 Copa del Rey; they had also employed the services of several (non-Basque) players from Atlético Madrid which was then a branch of the Bilbao club.67 This led to the Royal Spanish Football Federation introducing a rule for the next year's competition that all players must be Spanish citizens. As a large proportion of the players in that early era were Basque, relying on locals was no impediment to Athletic and they chose to maintain that approach even when the regulations were relaxed some years later.