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Grenal is the nickname for matches between two of Brazil's leading football clubs, both located in the city of Porto Alegre, state of Rio Grande do Sul: Gre refers to Grmio and Nal refers to Internacional. The Grenal is one of the fiercest football rivalries in Brazil, South America and the world.

Grmio has a long-standing and intense rivalry with Internacional, which is widely regarded as one of the fiercest in Brazil and around the world. Matches between the two teams are known as Grenal and are highly anticipated events.