CELTIC defender Mikael Lustig has been an Invincible before with Rosenborg.
Lustig was undefeated as he helped the Norwegian outfit to a memorable campaign seven years ago.
“We went close the season before, but the season after went the whole way and to go through two full seasons with just one loss was quite impressive.
“You only play 30 games a season in the Norwegian league, but still need to be focused to do it.
“There can be a referee decision or something that can change it, but our strength this season has been to go and go and go.
“It doesn’t matter if we feel as though we are struggling a wee bit, we just go on. It’s a long season and you are going to have some dips.
“In the games before last Sunday, we also dropped some points. But in the semi-final we proved we are back on top.