Aegean Marine Petroleum Network may need to write off $200m after an internal probe uncovered possible wrongdoing with the company's finances.

The international marine fuel logistics company said today it may need to take the loss after an audit of its books revealed possible improper accounting in violation of company policy.

"Based on the preliminary findings of the review, the audit committee believes that approximately $200m of accounts receivable owed to the company at December 31, 2017 will need to be written off," the company said in a news release.