The Thai police have submitted to state prosecutors the case of Xavier Justo, the Swiss national linked to an unravelling Malaysian government scandal, after completing their investigations.

Justo allegedly tried to blackmail his former employer, PetroSaudi International, an energy company which was involved in a failed venture with 1Malaysia Development Berhad (1MDB) in 2009.

He has signed a confession in the hope of a reduced sentence. If convicted, he could be jailed for one to 10 years and fined between 2,000 baht (S$80) and 20,000 baht.

The case was handed over yesterday morning and now, it is up to state prosecutors to indict Justo, police colonel Kornchai Klayklueng, deputy commander of Thailand's Crime Suppression Division, told The Straits Times.

Justo has been remanded in a Thai prison since he was arrested in June. He told The Straits Times while under custody last month that he had handed over documents allegedly showing 1MDB's financial mismanagement but did not receive the US$2 million (S$2.8 million) promised by Malaysian media owner Tong Kooi Ong.

Malaysian police have so far not been allowed any contact with Justo, said police colonel Kornchai.