Juan Jose Cobo in lead, Vuelta a Espana 2011, stage 17

After a relatively straightforward Vuelta a Espana stage on Thursday, Juan Jose Cobo (Geox) has revealed that he expects a major attack by Sky's two overall contenders, Chris Froome and Bradley Wiggins at Friday's tricky finish in Bilbao.

"Today [Thursday] wasn't at all complicated, we could control the race, but tomorrow will be another story," Cobo said afterwards.

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