The Celtic striker discussed what happened in the immediate aftermath of last week's disappointment.
The Hoops have kissed goodbye to the group stages of the UEFA Champions League for the second consecutive season.
It was a bitter blow to the manager, the squad and of course Celtic supporters.
Lennon though was quick to try and pick up his players in the wake of the 4-3 loss, reminding them that the famous team he was a part of in 2002/03 was similarly knocked out before going on to do impressive things in Europe that very season.
Back then Lennon, as a player, was part of a side dumped out by FC Basel in Champions League qualifying, but then went on to reach the final of the UEFA Cup.
That history lesson appears to have been part of his big message in the dressing room last week.
As quoted by The Scottish Sun, Griffiths explained: "The gaffer touched on the fact that when he was a player, his Celtic team were put out the Champions League and that season they made the final.
"He mentioned that straight after the game on Tuesday. So hopefully there is that silver lining to the cloud for us, too.
"If we do get through, and we can go on a decent run, then who knows where it can take us."
Can Celtic make a big impact in the UEFA Europa League this season?
It's important for Griffiths and his teammates to have ambitions and optimism, but Celtic have plenty to prove before anyone will be considering them to go on a Seville-era style run in the Europa League.
Some Hoops fans are likely even worried about reaching the group stages, with a tricky play-off against Swedish side AIK coming up on Thursday night.
Serious work still needs to be done on the squad before the end of the transfer window too.
Celtic are currently short at left-back and right-back, with the central defensive and creative areas arguably needing support too.
The Hoops need to get the business done on the park in this era, rather than reminisce about famous nights in the past.
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