Mourinho believes the tie is in the balance

Mourinho conceded that "normally the team that plays at home considers a draw a bad result" but insisted that "the tie is completely open".

He said: "Valencia believe they are in a better position as they are at home.

"But we can win there or get a draw and take them to extra-time. We can go to Valencia and reach the semi-finals."

News conference: Chelsea boss Jose Mourinho

Valencia scored what could prove to be a crucial away goal when David Silva thundered in a 30-yard effort to break the deadlock.

But Chelsea hit back through Didier Drogba to give themselves a lifeline for the return leg next week.

It seemed that Chelsea took a while to settle and struggled with Valencia's creativity in the first half, but Mourinho did not see it that way.

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He said: "The first half was not much different than the second half. I think they scored an absolutely amazing goal. But that is a goal that happens some times.

"It was a tough game for both teams - both were very tired. Chelsea tried to win the game and Valencia defended well with a lot commitment.

"In Valencia, we will need to play well and we know the atmosphere we will get there so we need a good referee, too.

"But I believe it will be a very hard game for Valencia."