Brendan Rodgers insists Celtic showed a different side to their game in digging out a goalless draw against Rosenborg to set up a Champions League third qualifier against AEK Athens.
The Scottish champions produced a commanding performance in the first leg at Parkhead last week to take a 3-1 lead to Norway.
However, the Hoops were more tentative in a first half at the Lerkendal Stadium which saw an added-time save from goalkeeper Craig Gordon prevent Marius Lundemo opening the scoring for the home side.
But Celtic kept their shape and discipline to see out the second half for a 3-1 aggregate win and they will now host AEK Athens next week.
Rodgers said: "It was a great demonstration that you can't always play perfect football, especially away in Europe, when you are under pressure and there are questions asked about your resilience and I thought we stood up to that very well.
"It was a clean sheet and that is always good in Europe away from home.
"We won the tie last week with a great attacking performance and defended well and last night it was more about being solid and keeping a clean sheet.
"We have achieved the objective, which over the two games was to get through. It was a different type of game to last week.
"Rosenborg played very well in the first half, they obviously needed to come out and take the initiative and they played well.
"We couldn't quite build the game as well as we would have liked but I was very pleased with the way we defended - that resilience and mentality."
Rodgers will now turn his attention to AEK Athens, who will visit Glasgow next Wednesday night.
He said: "I haven't watched them yet. They will be a good side but we are a good side and we hope to show that next week."
