Wenger lashes out at Hansson
Arsenal manager Arsene Wenger accused referee Martin Hansson of a "massive mistake" in his side's defeat to Porto.
Wenger was furious that Hansson awarded Porto an indirect free-kick after Lukasz Fabianski picked up Sol Campbell's 'back-pass'.
And the official then appeared to get in Campbell's way as Porto were allowed to take a quick free-kick to score their second goal.
"I believe it (the back-pass) was accidental, Sol touched it accidentally," Wenger said. "And the referee should give us time to build the wall."
Asked if Porto should have been allowed to act so quickly, Wenger added: "Yes, in the middle of the field, but not in the box. We had no chance to defend.
"I think it was a massive mistake, it was a double mistake."
Hansson was also the referee who failed to spot Thierry Henry's handball for France in their World Cup play-off with the Ireland, but Wenger would only add: "In a game of that magnitude, I don't understand his decision."