BRASÍLIA--Brazil's state oil company Petróleo Brasileiro SA will have to carry a heavy debt load for the time being and strengthen governance to mitigate corruption risks, Chief Executive Aldemir Bendine said on Tuesday.

Mr. Bendine said that Petrobras' asset-sale plan isn't enough to reduce its debt to a desirable level. As of Dec. 31, Petrobras' net debt was 282,1 billion Brazilian reais ($96.6 billion), up 27% from a year earlier and equal to 4.7 times earnings before interest, taxes, depreciation and amortization.

Mr. Bendine was speaking at the Senate's economic affairs committee, in a session expected to last for several hours as lawmakers ask questions about the company's troubled finances and its connection to a corruption scandal.

Petrobras released last week its first audited financial statements in more than eight months, as the company struggled to put a figure on its losses related to the corruption scandal.

Brazilian federal prosecutors since last year have been investigating allegations that the company's suppliers conspired to overcharge Petrobras for major projects, funneling some of the illicit profit to former Petrobras executives and politicians in the form of bribes and illegal political donations.

Petrobras, which has portrayed itself as a victim of the graft, says it has cooperated with authorities.

Last week, Petrobras reported around $17 billion in charges related to the alleged graft and to assets that were overvalued on its balance sheet.

Mr. Bendine, who took the helm in February, said that the investigations are limiting the number of suppliers Petrobras can have business with.

He also said that regulation mandating Petrobras to hold at least 30% of presalt oil projects, where reserves are located below the seafloor, means that any new well would stress the company's finances. But the company doesn't "need to invest in new wells right now," he said.

Write to Luciana Magalhaes at Luciana.Magalhaes@dowjones.com and Paulo Trevisani at paulo.trevisani@wsj.com

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