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PORTO, PORTUGAL - NOVEMBER 25: Michael Essien of Chelsea battles with Alvaro Pereira of FC Porto during the UEFA Champions League Group D match between FC Porto and Chelsea at the Estadio Do Dragao on November 25, 2009 in Porto, Portugal. (Photo by Hamish Blair/Getty Images)

PORTO, PORTUGAL - NOVEMBER 25:  Michael Essien of Chelsea  battles with Alvaro Pereira of FC Porto during the UEFA Champions League Group D match between FC Porto and Chelsea at the Estadio Do Dragao on November 25, 2009 in Porto, Portugal.  (Photo by Hamish Blair/Getty Images)