"There is no agreement between the party and Ronaldinho for him to launch a bid for a Senate seat," the party, Patriota, said.
Patriota is led by Jair Bolsonaro, a firebrand former army officer dubbed the "Brazilian Donald Trump" who is riding high in opinion polls ahead of next year's presidential elections.
O Globo's website reported Thursday that former Barcelona and Paris Saint-German star Ronaldinho was to run for a seat in the southeastern state of Minas Gerais.
The article showed a photograph of Ronaldinho with Bolsonaro, with the footballer holding a copy of a book by the politician.
Patriota's president Adilson Barroso said: "He is not a member of our party, but the door is open and it would be an honour to have him with us."
Ronaldinho, 37, won the 2002 World Cup with Brazil.
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