His side are second in Group F, two points behind leaders England, and the visiting boss says they are only focused on a victory.
"We expect an aggressive opponent and we have to be the same," Katanec said ahead of Sunday's World Cup qualifier.
"We must concentrate on the second ball."
Slovenia are unbeaten in the last seven internationals since a 1-0 loss to Turkey in a friendly last May, while the Scots lie second bottom of Group F after gathering only four points from four games.
But Katanec insists he will not be fooled into thinking the contrasting fortunes will automatically give his side the edge in Sunday's game in Glasgow.
"Scotland are at home, so they will be the favourites, but we want the win because, in this group, one point is not enough," he said.
It is a match described by his opposite number, Gordon Strachan, as a must-win for Scotland, but Katanec thinks Sunday's hosts have been unlucky so far.
"They are not as bad as their results suggest and some of the goals they have conceded so far have been unlucky," he insisted.
Slovenia captain Bostjan Cesar echoed his coach's thoughts on the Scottish style.
"They are aggressive all over the pitch, but they have good players," said the 34-year-old Chievo defender.
"They tend to play long balls, so the second ball is going to be very important for us.
"We expect a tough match."
The expected attendance at Hampden is only 25,000 - less than half capacity.
Cesar experienced the Hampden roar with Slovenia in 2004 and thinks it will be a boost for his side if the home fans stay away in numbers.
"If the stadium is not full then that could be a plus for us, but we still have to do our thing on the pitch," he said.
Cesar is hopeful of exploiting a defence that have shipped an average of two goals per game.
"They are aggressive all over the pitch and have good players, but maybe their weakness is at the set-pieces because they leave too much room for the opponents to score at that time," he said.

James Brindley, 26, died on Aldridge High Street in the West Midlands on 23 June after an evening out with friends.
Aaron Kahrod, 20, from Walsall Road, Aldridge, and a 17-year-old boy appeared at Birmingham Magistrates' Court.
The pair were remanded in custody to appear at the city's crown court on Monday.
Read more news from Birmingham and the Black Country

The indictment says Hubert Zafke was an accessory to the murder of at least 3,681 people during one month in 1944. It says he was an SS medical orderly.
The trial is to start on 29 February in Neubrandenburg. Mr Zafke remains at home, a prosecution spokesman said.
The Nazis killed about 1.1m people in Auschwitz, most of them Jews.
During the month covered by the indictment - 15 August to 14 September, 1944 - the teenage Jewish girl Anne Frank arrived at Auschwitz-Birkenau, the most notorious Nazi camp complex.
Her diary, describing the ordeal of her family hiding from the Nazis in Amsterdam, remains a worldwide bestseller. She died in Bergen-Belsen, shortly before that camp's liberation by the British Army in 1945.
According to the indictment, Mr Zafke served in the SS in a different part of the Auschwitz complex from October 1943 to January 1944, during World War Two.
Prosecutors say that, like the other SS guards at Auschwitz, Mr Zafke was well aware of the camp's function as "an industrial-scale mass murder site".
Last year a German court sentenced Oskar Groening, 94, to four years in jail as an accessory to the murder of at least 300,000 people at Auschwitz.
Known as the SS "book-keeper of Auschwitz", he was allegedly responsible for counting banknotes confiscated from prisoners.
How the Holocaust unfolded, year by year
Why did ordinary people commit atrocities in the Holocaust?
Slovenia must match Scotland's aggression if they are to take three points from Hampden, according to head coach, Srecko Katanec.
[NEXT_CONCEPT]
A man and a teenager have appeared in court charged with murder after a man was stabbed to death.
[NEXT_CONCEPT]
A 95-year-old former SS member will go on trial in north-east Germany next month accused of assisting in the mass murder of Auschwitz death camp inmates.