One of Sanader's attorneys Cedo Prodanovic entered the USKOK headquarters around 1000 hours and half an hour later he told reporters that the questioning and presentation of defence in one of the investigations against the ex-PM was scheduled for Thursday. He however, was unable to say where the questioning would take place.

The media speculate that Sanader would be questioned at another location due construction work in the Office of the Chief State Prosecutor and USKOK.

Prodanovic told the press he could not say how long the interrogation would last, adding however that it most definitely would not be done in two or three hours.

He said the lawyers did not speak to Sanader last night, stressing that prison officials called them late last night to inform them that their client was in a prison cell and that everything was all right.

Prodanovic said the defence team arrived at the Remetinec prison today to go over the defence they had prepared in Salzburg and "agree on some technical issues", without revealing which issues he was referring to.

Ex-PM Sanader was brought to Remetinec Prison in Zagreb around 2150 hours Monday after being extradited from Austria.

Sanader was transferred by car from a detention unit in Salzburg where he had spent the past seven months. He is in detention because an investigating judge had set on one-month detention set against him seven months ago because he is a flight risk and because might temper with witnesses in the Fimi Media case.

Sanader, who is also former president of the ruling Croatian Democratic Union (HDZ) party, is the prime suspect in the Fimi Media case. He is suspected of conspiring together with other suspects in the case, including former head of the Customs Administration Mladen Barisic, and of abuse of office to siphon funds from government ministries and state-owned companies through the private company Fimi Media. Some HRK 100 million is believed to have been siphoned off this way and some of the money ended up in the HDZ's slush fund.

Apart from the Fimi Media case, Sanader is suspected of illegal operations between the Croatian Power Company and the Dioki petrochemical company, owned by Robert Jezic. He is also suspected that in 1994 and 1995, in his capacity as Deputy Minister of Foreign Affairs, he abused his office by arranging with Hypo Alpe Adria Bank a commission of 7 million Austrian schillings in exchange for a 140 million schilling loan the bank approved to the Croatian government.

USKOK has widened the investigation against Sanader and Dioki owner Jezic on the suspicion that they attempted to gain an illegal profit of 10 million euros for Dioki at the expense of the state-owned oil pipeline operator JANAF.

In the meantime, Austria is investigating him and his involvement in money laundering, however no indictment has been issued yet.

Sanader was arrested on 10 December 2010 and has been in the Salzburg detention unit since.

Although he initially opposed his extradition to Croatia, claiming he would not get a fair trial in his homeland, the former PM recently changed his position and agreed to be extradited under a fast-track procedure.

His Zagreb-based attorney said the ex-PM did not want his case to block the closure of Croatia's EU entry talks.

During the investigation Sanader's property and accounts were frozen, as well as the accounts of his family, including those abroad. A valuable art collection was confiscated from his Zagreb home.