 He played a total of 51 matches in the season scoring two goals, including 25 Brazilian Série A matches.On June 8, 2018 Cuéllar extended his contract with Flamengo until June 2022, this new contract raised his release clause from €50m to €70m.Cuéllar continued to be a star player for Flamengo in central midfield, helping to capture the 2019 Campeonato Carioca.