Tonight is the El-Clasico . The battle that might decide the Spanish La Liga title. Ghen Ghen

Barcelona won the sides' Clasico meeting at Camp Nou in October, but now trail their arch-rivals by four points with 10 rounds of La Liga remaining.

Damaging defeats at Real Sociedad and Valladolid in recent weeks have left the Catalans off the pace in third (also a point behind Atletico Madrid), while los Blancos are unbeaten in all competitions since the loss in Barcelona 

But Iniesta believes his side can draw inspiration from past victories at the Santiago Bernabeu.

"More than ever before, we need to be brave," he said. "We have had to go there and win to claim La Liga in other years, so if we want to repeat that this year we'll need to do the same. We'll have to play the perfect match."

And he added: "There cannot be any negative thought or doubt - what we want is to win and to put pressure on the leaders."

Madrid's 'BBC' trio of Gareth Bale, Karim Benzema and Cristiano Ronaldo have hit the headlines in recent weeks after racking up 50 goals so far this term, but Barcelona's own triumvirate of Lionel Messi, Pedro and Alexis Sanchez have accumulated 49 strikes in 2013-14.