A total of 20 teams will contest the league, including 17 sides from the 2018–19 season and three promoted from the 2018–19 Segunda División. This will include the two top teams from the Segunda División, and the winners of the play-offs.
The first team to be relegated from La Liga were Rayo Vallecano. Their relegation was ensured on 5 May 2019, after Real Valladolid beat Athletic Bilbao 1−0, suffering an immediate return to the Segunda Division.
The second team to be relegated were Huesca, who were also relegated on 5 May 2019 after a 2−6 home defeat to Valencia, also suffering an immediate return to the second tier.
The third and final relegated club were Girona, who concluded their two-year stay in La Liga in a 1−2 away loss at Alavés on 18 May 2019.
On 20 May 2019, Osasuna were the first team to be promoted, after a two-year absence, following Granada‘s 1−0 win against Albacete.The second team to earn promotion was Granada after their 1−1 draw against Mallorca on 4 June 2019. This marks an end to a two-year absence in the first division.
The third and final team to earn promotion to La Liga was play-offs winner Mallorca, after coming back from a 2 goal deficit against Deportivo La Coruña on 23 June 2019. Mallorca return after a six-year absence in Spain’s top flight, spending one of those years in the Segunda División B and achieving two consecutive promotions.
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