"I dare to dream," the Celtic manager said firmly when asked about the possibility of repeating last season's achievement of defeating the Spanish champions. He will, however, need another hero to emerge.
The 2-1 victory last November still reverberates. It also remains relevant because of the belief and inspiration it will provide to Lennon's players. They watched the DVD of the game during last weekend, as if to remind them that such a feat can be possible to repeat. "Whether we can do it or not, I don't know, but we'll do everything we possibly can," said Lennon. "That win came out of left field last year but the performance in the [2-1 defeat in the] Nou Camp gave them great belief.
"We're at home, which always gives us an advantage no matter who we're playing and it can really lift you to another level - and that's what I'm hoping the atmosphere and the occasion will do again."
Tony Watt scored the decisive goal last year, before Lionel Messi struck a consolation effort in the closing moments. Watt is now on loan at Lierse in Belgium, with his career at Parkhead having stalled, and the scorer of Celtic's opener, Victor Wanyama, has also moved on. Lennon, though, is adamant that another figure could emerge as an unlikely match-winner for his side.
"I said to the players, 'do you think Tony went out there last year thinking he was going to be part of one of the greatest nights in the club's history?'" Lennon said. "That he would become the most talked about teenager in European football at the time? No, he didn't. But anything can happen on any given night. That was Tony's night and I want someone else to get the headlines he got this time.
"What Tony did was capitalise on a mistake and show great composure. We are going to need all that again. We have to be cute in our game management. I've more or less got my plan in place, because my hands are tied a little bit [with injuries to Joe Ledley and Dirk Boerrigter]."
Lennon will assess the readiness of James Forrest today, and could yet return the Scotland internationalist to the starting line-up if he has recovered sufficiently from a virus. Adam Matthews will, however, be fit to take his place in the side after falling I'll last weekend. Celtic will be ready, as much as anything to make up for the opportunities that were spurned in the opening Group H defeat against AC Milan at the San Siro last month.
"They don't mean not to score," Lennon said of his players. "But we had good chances in Milan and we do need to be better in front of goal. From tee to green in Milan, we were very good for long periods of the game. But this team are better than Milan. We just have to hang in there."