Kalou was an unused substitute during the first leg in Spain and is eager to help fire Chelsea to their second Champions League Final in as many years. "It will be tough but to win the Champions League, they are the types of sides you need to beat," said the 23-year-old. "I could be facing my friend, Yaya Toure, so that will be nice. We talked ahead of the match. He's playing regularly for them and had a good season."