City, who won the match 2-1 at the Estadio do Dragao, complained after Yaya Toure and Mario Balotelli were the target of racist chants.

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With both teams having already qualified for the knockout stages and large areas of seats at the Estadio do Dragao left empty, the atmosphere was somewhat muted throughout.

BBC: Chelsea strikers Nicholas Anelka and Didier Drogba

Arsenal will feel aggrieved after recovering brilliantly from their shambolic opening at Estadio do Dragao, yet there was still much on show to provide hope for the return leg in London on 9 March.

BBC: FC Porto 2-1 Arsenal