The triumph moved Barca up to fifth in the table on 35 points from 21 games, a distant 15 points behind leaders Real Madrid.
"We need to keep a calm head and know when to read the game. But also the players are at a low moment in confidence and we have to improve that. We celebrated the victory tonight, it's something very big and that says a lot," said XAvi.
But it did go some way to lift the disappointment of being knocked out of the Copa del Rey by Athletic Bilbao last Thursday and their exit from the Spanish Super Cup at the hands of arch rivals Real the week before.
"The players have been heavily criticised and today, for example, Jordi Alba had a very good game and (Sergio) Busquets and (Gerard) Pique led the team. Frenkie, he had a very good game. These are players who are being criticised and it's not easy to play for Barca. And I think the shirt for weighs 20 kilos more than any other.
"And that's why we have to be together and we know it's going to be tough, but we have to stay united. But I said it before I said that the Sun is slowly starting to come out, even though it was a very cold night here."
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