Kalou scored either side of halftime at Stamford Bridge to deflate the struggling Spanish side.
AC Milan fought back from a goal down to beat Real Madrid 3–2 in the Santiago Bernabéu stadium in Wednesday’s Champions League group stage feature game.
Real Madrid and AC Milan both have injury woes for their Champions League Group C match on Wednesday.
France must get past Ireland to reach the 2010 World Cup finals in a 2 leg qualification draw.
Aston Villa dumped Chelsea 2–1 on Saturday, the second consecutive league defeat for the Blues, which knocked them off the top of the table after Manchester United beat Bolton 2–1.
English Premier Division and Italian Serie A updates from matches played on Saturday.
England, without star players Wayne Rooney and Steven Gerrard, beat Belarus 3–0 at Wembley on Wednesday evening with help from a strong performance by David Beckham.
Argentina are favourites to come out on top of Wednesday's three-way race for South America's remaining World Cup places.
The U.S. men's national soccer team qualified for the 2010 World Cup in South Africa next summer with a stunning 3-2 victory over Honduras on Saturday night.
World Champions Italy secured a spot in next years soccer World Cup with a 2-2 draw against Ireland in Dublin.