Reports had emerged last week that the Brazilian state-led giant was already working to sell off as much as $5 billion of assets in Nigeria to customers including Asia players.
In January Petrobras was reported to have considered bids for parts of its Argentina subsidiary.
"Especially regarding its operations in Argentina and Nigeria, Petrobras asserts that its executive board has not taken any decision related to negotiations with these assets and, in case there is any material fact associated with this subject, the company will closely inform the market, according to the applicable law," it said in a statement.
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