Mikel Arteta admits Arsenal 'lacked aggression' after Champions League setback

Arsenal manager Mikel Arteta said his team lacked the cutting edge as Galeno's stoppage-time goal earned Porto a 1-0 win in the first leg of their Champions League last-16 clash.

The Gunners were appearing in a first knockout match in Europe's top tier competition for seven years, but struggled to get past Porto's defence before Galeno's brilliance in the 94th minute.

The defeat ended Arsenal's eight-game unbeaten run against Portuguese opposition and leaves them with plenty to do in the return leg at home on March 12.

"We lacked threat. We lacked aggression, especially when we had the ball in the final third," Arteta told TNT Sports. "So we will tweak a few things to attack better. We can do better."

"Obviously I am very disappointed the way we gave the game away at the end," he added.

"Not managing that situation well enough. You get punished in the Champions League. If you cannot win it, you don't lose it.