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Petrobras currently demands that local firms execute at least 65% of goods and services contracts in the oil and gas industry.
But in a statement, the company said it could be forced "to find alternatives" to meet production targets.
"We will seek suppliers of goods and services to guarantee competitive procedures and the best conditions for the company. This could eventually involve foreign firms," Petrobras is quoted as saying by local news portal Valor Econômico.
Federal police have so far filed charges against 36 suspects as part of the Car Wash probe.
Authorities say the investigation aims to dismantle an alleged US$4.5bn money laundering ring involving Petrobras directors, construction firm executives and high-ranking politicians.
Civil and criminal cases have also been launched against Petrobras in the US.