"I have ordered to immediately start an in-house probe into possible official misconduct. We cannot provide more details while the investigation is ongoing, but I want to assure you that if the information (about the disclosure) proves to be correct, my response will be strict and principled," Finance Minister Vilius Šapoka told BNS in a comment.

It was announced on Wednesday that only four members of the five-strong supervisory board, including two independent members and two officials from the Finance Ministry, the company's sole shareholder, had been appointed.

According to information available to BNS, law-enforcement officials had doubts about the reputation of a short-listed candidate.

The two independent members are Darius Daubaras, executive in corporate finance and corporate development at the global oil giant Saudi Aramco, and Daiva Lubinskaitė-Trainauskienė, personnel director at the US-owned Lithuanian medical equipment producer Thermo Fisher Scientific Baltics.