Flamengo head coach Jorge Jesus described his side's Copa Libertadores triumph as "the most important title of my career".
Two goals in three minutes from Gabriel 'Gabigol' Barbosa saw Flamengo snatch a 2-1 victory over defending champions River Plate in Lima on Saturday.
Flamengo were trailing to Rafael Santos Borre's first-half strike, until Gabriel equalised in the 89th minute and netted the winner three minutes later.
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A three-time league champion with Benfica, while he also claimed silverware at Braga, Sporting CP and Al Hilal, Jesus revelled in the achievement.