The Scottish champions are close to qualifying for the group stage of the competition after a 2-0 victory in Sweden last week, but Lennon insists that he is only focused on the match at Celtic Park.
"I am sitting here a lot more comfortable than I would be if it was 0-0 or 1-1 or we were chasing the game," Lennon told reporters. "We are at home but we know the tie is not over yet. I am not getting ahead of myself. We still have to qualify against a very good, motivated Helsingborg team.
"I can't look too far ahead. Football has a funny way of kicking you when you think you have cracked it.
"We have prepared as low-key as we possibly can for this game because we know there is a lot of hype surrounding it and we are trying to protect the players from it."
Celtic head into the game in good form after a 4-2 triumph away to Inverness Caledonian Thistle on Saturday.