US firm LeBoeuf Lamb Greene & MacRae is working on plans to open an office in Brazil.
James Johnson, head of the firm's London office, said: “It's very early days. We haven't opened an office nor are we at the point of opening.”
But he added that Brazil was one of a number of locations the firm was “seriously contemplating”.
“Ultimately we will be there but I don't know when,” he said.
The news comes a few weeks after the opening of an office in Houston, Texas, primarily to support the firm's thriving energy practice, a practice area which is a key element if the firm's international expansion.
Outside the US, LeBoeuf Lamb has other offices in London, Moscow, Almaty and Tashkent.
It is the latest international firm to show interest in Latin America's largest economy.
Hector Steel & Davis, one of Miami's largest firms, recently established links with local firm, Moreira Lima & Royster, while White & Case, Linklaters and Richards Butler have set up offices in Sao Paulo in the last 18 months.
Baker & Mckenzie and Clyde & Co also have offices in the country.