Vermaelen saw red just before the break for bringing down Guillermo Franco, but Alessandro Diamanti saw his spot-kick well saved by Manuel Almunia.

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However, Gunners goalkeeper Manuel Almunia saved Alessandro Diamanti's resultant penalty to preserve the lead given to the home side by midfielder Denilson in the fifth minute.

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Goals from Fredy Guarin and Rodrigo Palacio put Inter in a commanding position but two goals in four minutes from Alessandro Diamanti and Manolo Gabbiadini pushed the match into extra time.

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Kieron Dyer's pace down the right wing proved a menace to the Potters' defence, but with his fitness clearly still an issue, he failed to start the second half, giving way to Alessandro Diamanti.

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