Suppan said a simplified extradition procedure was not discussed, since Austrian law stipulates that this is possible only at a second hearing in 14 days.

Sanader is being treated well in custody and "hasn't complained about anything," he added.

Sanader was first interviewed by the investigating judge on Saturday.

Details have still not been discussed, Suppan said, adding it was "practically impossible" for Sanader to be extradited to Croatia before the next hearing in a fortnight.

Suppan said the former PM "is genuinely interested in cooperating with the Croatian authorities" and that he claimed he had not been running away.

Suppan added Sanader was getting along well with his cell mate and that he was "very focused" during the hearing.

The Salzburg prosecutor's office is still waiting for the case file on Sanader to arrive from Croatia, APA said, adding that spokeswoman Barbara Feichtinger said she expected the documents by Tuesday at the latest. That day the prosecutor's office is expected to hold a press conference.

Sanader was arrested near Salzburg on Friday on an international warrant issued by Croatia. He left Croatia the previous morning before parliament stripped him of immunity from prosecution. Croatia's anti-corruption agency USKOK suspects him of conspiracy to commit crime and of abuse of office in the case of the marketing agency Fimi Media and in the illegal sale of electricity by the state-owned power company HEP to the petrochemical company Dioki.