 On August 30, 2019, Saudi Arabian club Al-Hilal announced the signing of Cuéllar from Flamengo.The fee was reported to be €7.5m.Gustavo played for Colombia U17 in the 2009 FIFA U-17 World Cup, he appeared in all seven matches and scored two goals, both against Gambia in a 2-2 draw, as the team finished the tournament in fourth place.