Investigating judge Erna Drazancic on Friday sent a summons to Josef Rothaichner at the address stated in the court file, said Zagreb County Court spokesman Kresimir Devcic.
Foreigners are questioned in the same fashion as Croatian citizens, but the court must provide an interpreter if they do not speak Croatian.
According to statements which witnesses Snjezana Siprak and Hrvoje Petrac made at a retrial for the kidnapping of Zagorec's son, Rothaichner gave Zagorec in 1993, when he was assistant defence minister in charge of arms and equipment procurement, a bag of jewels as collateral for USD5 million taken from the Defence Ministry for the purchase of arms for Croatia's defence.
Zagorec has said on a number of occasions that those claims are untrue and has dismissed accusations that he took the jewels with him when he left his post at the ministry in 2000.
The investigating judge is also expected to question Josip Ferek, a former business partner of Zagorec's who failed to attend yesterday's hearing due to illness. No date has been set yet for the questioning of the witness whom, according to the judge, Zagorec might tamper with, which was why an order has been issued that he be placed in custody.
The investigation against Zagorec was launched on March 9, and four days later he was arrested on an international warrant in Vienna where he has been living for the past seven years. He was released from detention after paying EUR 1 million bail. On March 21, the Justice Ministry sent Austrian authorities a request for his extradition, which Zagorec objects to.