The Scottish champions stunned their Spanish counterparts at Celtic Park back in 2012 and will now look to repeat their success in this season's Champions League.
EXCLUSIVE
There is no tougher question in football: How do you stop Lionel Messi?
The former Celtic manager Neil Lennon has an answer, because his most famous moment as a coach came in the Champions League on November 18, 2012, when Celtic had 11 percent of the possession according to some analysts but defeated Barcelona 2-1 at Celtic Park.
Now coached by Brendan Rodgers, Celtic faces the same task once again.