The former Start defender said: "Of course we travelled with the aim of going through and we felt during this game we could have scored a goal and that's what we needed".
Lustig, 31, is an experienced campaigner as besides making 224 appearances in all competitions for Celtic, he also has 62 caps for Sweden to his name.
Aberdeen have at least had a week to recover from their below-par performance in Edinburgh, but Kristoffer Ajer, Celtic's 19-year-old Norwegian central defender, discounted the notion that the champions would be vulnerable after their setback in St Petersburg and the long journeys to and fro.
Rangers edged ahead of Aberdeen into second place on goal difference on Sunday and now face a test of their staying power with today's visit of Hearts, who left Ibrox with a goalless draw in August, when the hapless Pedro Caixinha was still in charge in Govan. Reaching the Champions League group stage and then having a brief crack at the Europa League is as good as it gets for them now.
"At 2-0, we still have an opportunity in the game".
"It has been fairly well covered how few goals they concede", Murty said.
"That, in turn, makes it more hard for our players but our players should relish the challenge of that and take that as a compliment".
"If it takes 95 minutes to get a 1-0 and it's been a bit scrappier than we'd have liked, we have to be professional and pragmatic enough to accept that it might be what gets us closer to where we want to be".
Visiting coach Maurizio Sarri named a strong team, and Piotr Zieliński's first-half goal gave Napoli hope.
"Of course we are up against the best of the best".
"But frankly, after a 3-2 defeat on home turf, we were in a hard position".