SÃ O PAULO—A former high-ranking Petrobras executive serving five years in prison for his role in a massive corruption scandal has begun talks with prosecutors in a bid to shorten his sentence, according to two people familiar with the talks.

Nestor Cerveró , a former director of international operations at Brazil´ s state-run oil firm Petró leo Brasileiro SA, was convicted in May of money laundering. Authorities sentenced him to five years in prison and fined him 543,000 reais (about $173,482).

Mr. Cerveró 's discussions with prosecutors are preliminary and it is unclear whether or not they will lead to an agreement, one of the people said.

Brazilian authorities last year uncovered a decadelong corruption scheme that has touched the highest levels of business and government. Prosecutors say the nation's largest construction firms colluded to inflate the price of Petrobras contracts by billions of dollars, kicking back a portion of their ill-gotten gains to corrupt company insiders and politicians. Some of the accused have denied the allegations while others are cooperating with prosecutors. Petrobras has said it is a victim of the scheme and that it is cooperating with authorities.

Prosecutors accused Mr. Cerveró of accepting $40 million in bribes from a supplier for arranging contracts totaling $1.2 billion. Mr. Cerveró was the director of Petrobras' international operations from 2003 to 2008 and later became the chief financial officer at Petrobras' fuel-distribution subsidiary, a post from which he was fired in March 2014 after the scandal surfaced. Mr. Cerveró has repeatedly denied wrongdoing.

Plea bargains have been a key tool for Brazilian authorities as they work to piece together evidence of the corruption scheme, which may involve dozens of companies and hundreds of suspects.

Prosecutors have already granted 18 such deals, including one to Petrobras' former director Paulo Roberto Costa, who provided authorities with crucial information about the inner workings of the alleged bid-rigging-and-bribery cartel. Arrested in March 2014, Mr. Costa was convicted in April 2015 of money laundering and corruption. He was sentenced to time served plus 18 months of house arrest. Lawyers familiar with the case said Mr. Costa could have been sentenced to dozens of years in prison if not for the plea deal.

According to a person close to Mr. Cerveró , the former executive is now trying to follow the example of his former colleague to reduce his sentence.

A spokeswoman for prosecutors in the Southern city of Paraná , who are heading the investigation, declined to comment about a potential plea bargain for Mr. Cerveró , saying she would only comment on signed deals.

Write to Luciana Magalhaes at Luciana.Magalhaes@dowjones.com

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