The Bhoys beat the Swedish club 2-0 in their away bout last week but were lucky not to concede on a few occasions with goalkeeper Fraser Forster making some vital saves.
Ahead of Wednesday's return leg at Parkhead, defender Rogne is looking for a much-improved showing which will enable Celtic to obtain a spot in the group stage proper of Europe's premier club competition.
"We've played better games," Rogne said. "Fraser kept us in it, especially in the first half.
"I wouldn't say we were lucky but the result could have been different, and we could have scored more at the end as well.
"I know we can play better than what we did but the result was massive. We can step up our game and hopefully we can do that on Wednesday.
"We are confident because we got a good result away from home which was important, but it's not finished as 2-0 is a difficult lead.
"They have nothing to lose and they will want to come here and play their football. They showed last week they are a good team, so it will be a tough game but we're all looking forward to it.
"We believe in ourselves, our team and group, and believe we can get a good result on Wednesday."