Campbell’s first Arsenal goal since the 2006 Champions League final hauled his side back on level terms after Porto had taken an 11th-minute lead through Lukasz Fabianski’s own goal.
And it got worse for the Polish glove-man in the 51st minute when he lazily collected Campbell’s back-pass, giving the home side an indirect free-kick inside the danger zone.
Falcao collected the pass and duly stroked Porto in front, heaping even more egg on the face of Fabianski in the process.
But, despite the mistake, Campbell refused to blame the 24-year-old keeper for the blunder, preferring to point an accusing finger at Hansson.
“He’s about 20 yards away from the situation,” said the defender.
“Then even after the free-kick he was blocking me to get to the ball as well so a bit of a nightmare there.”
Arsenal manager Arsene Wenger was left fuming by the decision to let the goal stand, and his defender was in full agreement.
When asked if he thought the referee got the decision wrong, Campbell said: “I think he did yeah, because he’s blocking me to get to the ball, so he’s basically just given them an advantage.
“It is quick thinking, but if the referee's in front of me. What can I do? Shove the ref out the way? I don’t know.”
Although the Gunners failed to register their first win at the Estadio do Dragao, Campbell’s 17th-minute header secured an invaluable away goal.
Now the former-England defender is looking forward to facing Porto at Emirates Stadium on March 9.
“You can go on and on about the game but I think the main thing is at least we got the goal,” he said.
“We’ve got them at home and hopefully we can get the right result."
