Without naming the suspect, the General Police Department police said on Saturday that a person detained as part of Thursday's house searches was brought to the Maribor District Court, which extended his 48-hour detention, which expired at 6 AM.
However, Šiško's lawyer Viktor Osim confirmed for the STA that the person involved was Šiško.
The other suspect in the Štajerska Guard scandal who was detained on Thursday was released from police detention the same say.
Šiško is suspected of incitement to subversion of constitutional order and of possessing unlicensed assault rifle.
"What Šiško is suspected of does not constitute a crime. I'm convinced the whole thing will fall through," Osim said, adding that Šiško would be heard by the judge on Sunday.
The lawyer expects Šiško to be released. Should the judge decide to remand him in custody, Osim will lodge an appeal.
Meanwhile, the head of the Maribor prosecution service, Darko Simonič, told the STA that Šiško was scheduled to appear in court on Sunday at 2 PM.
Asked whether the court would send him in custody, Simonič said the only possibility not to do so was if the suspect managed to persuade the judge to the contrary with his defence.
In support of Šiško, a small group of his supporters and his parents gathered in front of the court this morning, but has already left the scene.