Eighteen teams competed in the league – the top sixteen teams from the previous season and two teams promoted from the LigaPro. Nacional and Farense were promoted on 5 May 2020 by decision of the Liga Portuguesa de Futebol Profissional, after the suspension of the 2019–20 LigaPro due to the COVID-19 pandemic in Portugal. This decision was made based on UEFA's recommendations, focusing on sporting merit, as these teams were in first and second place of the LigaPro, respectively, at the time of cancellation.