The Hoops take on Barca in their second Uefa Champions League group H game on Tuesday night and Lennon believes his team can gun down the La Liga side once again.
Goals from Victor Wanyama and Tony Watt gave Celtic a 2-1 win over Barcelona last season and Lennon will look to use the example of that glory night to inspire his current team.
"What I've done with the players is give them a copy of last year's game and I want them to study it," explained Lennon.
"It shows them what they have to do to get a result - and that it can be done. The concentrations levels and intensity they'll have to play, I'll need to remind them of that. I don't want them going into the game cold. I think in the main the players will know what's coming. Sometimes you get little reminders in games that you forget about, certain instances, maybe set-pieces or attacking play they had and what they did, how they shaped up.
"All it is is more of a reminder than anything else."
Lennon's preparations for the game will be boosted by the return of James Forrest who has returned to the club following a brief stint in hospital.
The winger is still feeling the effects of a respiratory virus which has seen him drop a few pounds in weight, but he is expected to join the rest of the squad at training on Sunday.
And Lennon will have no hesitation in deploying his talents against Barcelona.
"We've just got to try and beef him up now, get some food into him," said Lennon.
"He'll train tomorrow on his own and then join up with the squad on Sunday.
"And if he's pain free then he'll go into the squad for Tuesday night.
"That would be a huge, huge lift for us going into these games.
"We missed him in Milan when the game became stretched. I thought it was tailor-made for him.
"At this level, with his quality and pace, he makes us better."
Long-term, Lennon is already planning for the January transfer window where he hopes the club can tie up deals for players so that by next summer he has a squad already knitted together for the critical Champions League qualifiers. We are looking to January to bring players in for the remainder of the season and then for the qualifiers again in the summer," said the Celtic manager.
"Then we wouldn't have a rush job over the summer, trying to get players in early and trying to get them adjusted to life here. That's what we're looking at.
"We have got money to spend, but we have to look after the future as well.
"If we didn't have Champions League football this season then we would have had to look at selling another player.
"That's the differential between Europa League football and Champions League football.
"You have to be mindful of that going forward."