"I have been agonising over this tie for a long, long time, probably since we picked up the [league] trophy in May. I have been in a wee bubble for the last six or seven weeks so it s big relief for myself and a big release of pressure," said Lennon.
"It was a really tough tie. The first goal was huge, if it had gone to HJK Helsinki it would have given them a massive lift but overall, on the balance of the game, we were the far superior team.
"It was a really tough tie. Psychologically for me, it is big because I haven't got through the last couple of years but we have built a good team here and they delivered tonight and answered a lot of questions."
The result guarantees the Scottish champions at least a place in the Europa League group stages.