The first leg wrapped up 1-1 at Camp Nou last week, with Barcelona lost bounty of great chances.
"Barcelona were incredible when we had a particular fashion of play and we have misplaced it a bit," Xavi said at the pre-coordinate press conference.
"We are on the way to recuperate it. It may be a litmus test to see in the event that we are able to [do it] since they are a Champions Alliance adversary.
"Each diversion could be a last and indeed more so on the off chance that we safe house't done our homework from the domestic amusement.
"We got to play on their field, at [Stadio] Diego Armando Maradona. We have reasons to appear that we are able to compete. It's our concern since it's the another diversion. [We ought to go] day by day.
"They're an adversary that contains a Champions Association family. It's great verification [whether] Barcelona can compete in Europe against a solid club.
"I think they will put tall weight on us, it'll be troublesome to play within the rival's half since they are an awfully physical match."
Xavi concedes that it would be a enormous disappointment to be thumped out at this stage of the competition.
"It would be a enormous disillusionment to be disposed of," he said. "We are aiming to be idealistic.
"We competed exceptionally well within the to begin with leg and presently we ought to play here.
"In case we are at the level of the Barcelona that we are seeing recently, we have a great chance.
"I predict an awfully intense amusement."
After it was said that Ousmane Dembele ought to take off Barcelona on the off chance that he fizzled to sign a unused deal, the Frenchman was back within the starting line-up against Valencia, and Xavi says there are no issues between him and the player.
"I safe house't had a single issue with Ousmane and I've examined everything," he said.
"He's proficient, he takes care of himself. In the event that he had been a terrible proficient we might have chosen something else.
"Let's see what happens at the conclusion of the season. He's a footballer that I like."
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