Arsenal manager Arsene Wenger criticised referee Martin Hansson for allowing the controversial goal which left his side trailing in their last-16 Champions League clash with Porto.
Polish goalkeeper Lukasz Fabianski, deputising for the injured Manuel Almunia, was caught out of position to gift Porto an early lead.
Veteran Sol Campbell equalised with his first Arsenal goal since the 2006 Champions League final, only to then be involved in the controversy at the start of the second half.
Fabianski picked up what was deemed a back-pass from the former Gunners captain, with Hansson – the Swede who missed Thierry Henry’s infamous handball in France’s World Cup play-off win over the Republic of Ireland – letting it be taken quickly as Falcao swept the ball into the net.
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