You can have how many foreigners you want but to register for playing for La Liga, until 3 players. And each league has own registering/playing rules, even the youth ones. Edited June 5, 2020 by tiago_wakabayashi "until" for "players" and "teams" for "ones"

List of foreign La Liga players. This is a list of foreign players in La Liga. The following players: have played at least one La Liga game for the respective club. have not been capped for the Spanish national team on any level, independently from the birthplace, except for players of Spanish formation born abroad from Spanish parents and Granada CF players wear t-shirts protesting the European Super League before their La Liga match against SD Eibar at Estadio Nuevo Los Carmenes on April 22, 2021, in Spain. Fran Santiago/Getty Images
The clubs are in the second or third districts, but can hold non-EU players until the expiration of the contracts. According to a decision adopted by the Spanish federation, La Liga and A second-class football should use the rules as much as possible in the country and allow as much as possible their foreign trophic team. Foreign Players
players in the A-squad (maximum 25 players, including a maximum of three goalkeepers) must wear a number between 1-25. Goalkeepers must wear either 1, 13 or 25. When players from the reserve team are selected to play for the first team, they are given squad numbers between 26 and 50. 24. donGaboz. • 5 yr. ago.
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la liga rules on foreign players