Nova Iguaçu and Macaé qualified from the 2019 Campeonato Carioca relegation playoff. Americano and Portuguesa were the two lowest placed teams in the 2019 Campeonato Carioca main tournament. Friburguense and America were promoted from the 2019 Campeonato Carioca Série B1. The First round was contested from 22 December 2019 to 11 January 2020.
