Joe Cole believes Chelsea will need to dig deeper than they have so far this season if they are to take anything out of their Champions League clash with Valencia.

Although Chelsea claimed the upper hand on their previous visit to the Mestalla when a late Michael Essien goal earned them a place in the semi-finals of last season´s tournament, the Blues cannot be considered favourites for Wednesday night´s return encounter.

"It´s a tough place to come and they are a side with great players," Cole said. "We need to be five to 10% better than we´ve been all season. We need to improve. That is everyone, including myself, we are not firing on all cylinders at the moment."

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