Although Chelsea held Barca to a 0-0 draw in last week's first leg at the Nou Camp, the Catalans' stunning 6-2 away win against reigning Spanish champions Real Madrid - which featured two goals from star forward Lionel Messi - four days later illustrated the size of the task Guus Hiddink's men still face. Chelsea's success eight days ago owed much to their ability to keep Messi, who has 36 goals this season, quiet even without suspended left-back Ashley Cole.