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Daniel Ochoa de Olza, Associated Press
Barcelona's coach Pep Guardiola reacts a Spanish La Liga soccer match against Real Madrid at the Camp Nou stadium, in Barcelona, Saturday, April 21, 2012.

BARCELONA, Spain — Still recovering from a morale-busting loss at home in the Spanish league, Barcelona will need to quickly regroup to beat Chelsea and overturn a first leg deficit in the Champions League semifinals.

The defending champions in both Spain and Europe lost to Real Madrid 2-1 on Saturday and now trail their biggest rivals by seven points with four games to go. Last week, the Catalan team lost at Chelsea 1-0 in the first leg of the Champions League semifinals.

Chelsea is unbeaten in its last six meetings with Barcelona, and the English team will likely keep to its defensive tactics in an attempt to stop Lionel Messi from influencing the match.