The Argentine has stressed that the Blaugrana's successes in recent years should not be forgotten, and has urged them to remain focused
The Blaugrana beat the Serie A outfit 4-0 on Tuesday to turn around the 2-0 defeat from the first leg and Mascherano has stressed that Barca must keep up their current form.
"What we have achieved in the last five years is crazy. This team is still competitive, and that’s what we should be appreciating," the Argentine told Barca TV.
"We shouldn’t turn one defeat into a tragedy. And neither have we now suddenly entered paradise. We have passed this test, but there are still eight great teams left in the Champions league.
"We have to carry on like that. This club can’t let its arms down.
"Let’s hope there are no more setbacks. We have to make sure we stay on this track, regardless of results."
Barcelona are currently preparing for the Liga match at home against Rayo Vallecano.