Barcelona coach Xavi has declared tonight's Champions League clash with Inter Milan "a final".
Barca need victory to keep their chances alive of reaching the round of 16.
Xavi said, "What happens tomorrow is transcendental.
"We haven't done our homework and now we have an opportunity to get back together in the group."
About Inter, he is clear that they will repeat the plan that was played out in Milan, but he has assured that the team knows what it has to do and is aware of what is at stake.
"It's a final and we have no margin for error," he added.