Chelsea ace Juan Mata believes Fernando Torres could be their secret weapon tomorrow night at Barcelona.

Mata reckons Torres could be the key to beating Barcelona, who lost to Real Madrid at the weekend.

"On the counter-attack he's going to be very dangerous, always a threat on the shoulder of the last man," said Mata.

"We're capable of scoring at the Nou Camp. We can hurt them on the counter-attack.

"The Nou Camp is a big pitch, and they're going to try and open up the spaces. But we're always dangerous on the counter in those situations, especially the more open it is."