Porto opened the scoring when Fabianski let Silvestre Varela's cross slip into the net after only 10 minutes before Campbell hit back with a header to equalise and score his first Arsenal goal since the 2006 Champions League final.

BBC: Arsene Wenger is unhappy with Porto's winning goal

It got worse for the Dons four minutes into the second half, when Langfield smothered McDonald's attempt at a cross but let the ball slip from his grasp for the Australian striker to fire into the empty net.

BBC: CHOOSE A SPORT

With Everton rattled, Wes Hoolahan squandered a great chance to make it 2-0 when he profited from a Neville slip, but overhit his cross.

BBC: eng-prem