The Workers' Party (PT) lost the dispute over the command of Itaipu's financial directorate to the centrist party.
The state-owned company controls the largest hydroelectric power plant in Brazil.
According to CNN, André Pepitone will take the post.
The nomination had been advocated by Alexandre Silveira (PSD) and other senior members of the party.
Among them are Rodrigo Pacheco, president of the Senate, and Gilberto Kassab, founder of the party.
The formalization of his name to the Brazilian Company of Holdings in Nuclear Energy and Binationals (ENBPar) was on Wednesday, 5.
Pepitone served in the same position during. . .
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