The Bhoys did the unthinkable and knocked off the Catalan giants 2-1 at Parkhead in the group stage last term which leads Commons to believe that he and his teammates can go in to Tuesday's home encounter without too much to worry about.
"If anything there is less pressure," he told the Celtic View.
"We're not expected to beat Barcelona, no one is. Last year was a really special moment. It was the 125th anniversary, we had the big display before the game and it all came about in a way that made it a really special moment in Celtic´s history.
"Barcelona will maybe be more fired up this time to show that it was just a fluke result, but without a doubt we have some very technical individuals in our team who will be looking to take as many points as we can."