Flamengo are the biggest team in Rio de Janeiro in terms of fan numbers and also the most widely supported side in Brazil claiming to have more than 40 million supporters nationwide. Being the most popular for the masses also sets Mengão up as being the most unpopular for just as many.

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Rivalry among Rio de Janiero's four main Serie A clubs (Flamengo, Botafogo, Fluminense and Vasco da Gama) is intense with a particular accentuated tension between Vasco fans and those of 2019 Copa Libertadores finalists "Fla".

Ahead of Flamengo's showdown with River Plate in Lima on September 23rd, a group of Vasco supporters have shown their antipathy towards Jorge Jesus' side by commissioning bespoke "RiVasco" shirts incorporating both the red and black diagonal sash featured on the Vasco and River Plate shirts along with the motif "Jamais serão" (It will never be) along with club emblems adorning the shirt.