Lewandowski insists Barcelona can upset Real Madrid

Barcelona striker Robert Lewandowski insists they can upset Real Madrid on Sunday.

Barca go to Madrid as rank underdogs.

Lewandowski said: El Clasico is always a special game, not just for us but for all the people in the world.

"For everyone waiting for this game I hope that we show very offensive football for the fans of the world, and we are ready to win this game.

From one side we respect his [Xavi] decision [to leave] and now we are focused just for this season because we know it is very important. We have fixed some problems and challenges that we had and the way now is very, very good and we are still fighting, still trying to win every game and we try to do this until the end of the season."