The Hoops moved on to the third round of qualifying for Europe's top club competition on Wednesday evening as they sat back on the two-goal advantage secured with last week's 3-1 win at Celtic Park.
The reigning Scottish champions had to withstand spells of pressure from their Norwegian opponents and Rodgers was quick to praise the work of young defensive duo Jack Hendry and Kris Ajer.
"I was very pleased with how we defended, with that resilience and mentality," Rodgers said. "Tonight was a great demonstration that you can't always play perfect football, especially away in Europe.
"When you are under pressure, questions are asked of your resilience and I thought we stood up to that very well."
He added: "The likes of Jack Hendry, I thought he really stood up in the second half, he won some great headers and was really dominant. Kris Ajer, as well.
"Cristian Gamboa again done very well, and Odsonne had a wonderful piece of skill.
"Overall, just the mentality of the team, we won the tie last week with a great attacking performance."
Celtic can now look forward to a third-round tie against Greek side AEK Athens, with the first leg at Celtic Park on Tuesday.