The 6-1 pain in Spain left the Hoops boss with sleepless nights as his side equalled the club's worst ever Euro defeat.
But while Lennon says the humbling at the hands of the Spanish giants was discussed at a board meeting yesterday, he is determined to build his team up again to challenge next year.
He said: "I might get the sack tomorrow, I don't know. I'm the manager of Celtic and it's a privilege to be the manager of Celtic.
"You have good days in the job and you have bad days in the job. In the last couple of years, the good days have way outweighed the bad days.
"People say a manager can only take a team so far - well, you build another team then. That's the challenge. It's the motivation.
"You feel lousy following a performance like Wednesday and it damages your record, if you want to call it that.
"So the motivation is to have a new start and go again and see if I can build another team that is as good as last year's."
But Lenny's pain clearly remains raw.
He said: "People look at you, your family and friends. They give you a sympathetic, 'you're all right' look, with a wee smile.
"You feel like you're really ill or something like that. But I don't need sympathy.
"We've been pretty successful, we've had a bad campaign but it is where we are and we look to build on that and progress and get better."
But Lennon believes the Nou Camp thrashing was not his worst result in European competition since taking charge of the Parkhead club.
He said: "Someone asked me the other night was it my worst result and it probably is in terms of the score line but if it wasn't Barcelona it would be.
"Utrecht away was far more damaging I felt with the players we had at the time and the level of the team we were playing."
When it came to Celtic's summer signing spree in the £1-2million bracket, Lennon was adamant the Hoops must remain prudent in their recruitment drive.
He said: "They are good enough for this level and that's fine, but it's up to me to make them take that step up to Champions League level - and maybe they take a bit of time.
"It's an unrealistic expectation to think that we can make the last 16 on a regular basis."