Manchester United midfielder Michael Carrick admits Real Madrid's domestic form has them nervous ahead of tomorrow's Champions League clash.

While United will fancy their chances with an away goal under their belt, there is still plenty of life left in the tie.

Carrick admitted: "It's not very often teams go to the Nou Camp and come away with a scoreline like that.

"They played some textbook counter-attacking football, absorbed the possession Barcelona had and hit them on the break. With the players they have and the spaces other teams leave, that's what we'll have to try to counteract."