In just three words, Barcelona centre back Gerard Pique summed up the feelings of Blaugrana die-hards after beating Real Madrid 4-0: "We are back."

It was a stunning display away from home at the Santiago Bernabeu for Xavi's side, netting two goals in each half to spin the Spanish football world on its axis for a night.

Pique played all 90 minutes alongside centre-back partner Eric Garcia, marshalling a stout defence to a stylish clean sheet and providing an outlet for the Barcelona midfielders as they retained 60 per cent of the possession.

Barca are now on a 10-match unbeaten streak in LaLiga, with six wins and four draws, as well as making it through to the quarter-finals of the Europa League, where they will play Eintracht Frankfurt.

They also have a record of eight wins and three draws from 11 matches in all competitions since the closing of the January transfer window, sporting a goal difference of plus-21 during that span.

Since Xavi took over in early November, Barcelona have taken 37 points from 16 LaLiga games, while Madrid have claimed 39 from 17 outings, indicating the rivalry may be much closer than this season's table indicates.