 Flamengo won the 2017 Campeonato Carioca with 6 appearances by Cuéllar.On June 28, 2017 in a Copa do Brasil match against Santos at Ilha do Urubu, Cuéllar scored his first goal for Flamengo in a 2-0 victory.Only after Flamengo signed compatriot Reinaldo Rueda as head coach did Cuéllar manage to take a starting position in the midfield.