Nicolas Anelka stunned Porto for the second time this season as Chelsea finished top of Group D with a 1-0 victory in the Estadio do Dragao.
Anelka, who scored the winner when the two teams met at Stamford Bridge, stooped to head home a cross from Florent Malouda in the 69th minute.
But overall it was another uninspiring performance from the Blues who had the woodwork to thank in the first half when Fernando Belluschi's 25-yard effort smashed off the crossbar.
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