Gustavo Cuéllar member of sports team Clube de Regatas do Flamengo
Flamengo
On January 20, 2016 Deportivo Cali confirmed that Cuéllar would be transferred to Brazilian giants Flamengo. The transfer fee was reported to be close to R$8 million for 70% of his economic rights.In his first season with the Brazilian club he could not establish himself as a regular starter. Cuéllar played 16 Brazilian Série A matches, only four as a starter, and managed to play a total 33 matches throughout the season.
During the beginning of the 2017 Brazilian Série A season rumors in the Brazilian media linked Cuéllar with Vitória on a possible loan. Despite the interest from other clubs, Cuéllar started to receive more chances in the first team, including playing as a starter. 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. 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. He continued to be a transfer target for some European clubs. In August 2019, Cuéllar was be suspended from club activities indefinitely for refusing to travel with the team for the following league match, citing family matters. He was reintegrated into the squad ahead of Flamengo's Copa Libertadores quarter-final match against Internacional, which would be his final match for the club.
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