Arsenal boss Arsene Wenger regards Barcelona as favourites for the Champions League.

"Perhaps Barcelona are the favourites because they had the most convincing win and have scored more goals than anyone else in Europe," explained Wenger.

"They are considered by many people, understandably, to be the favourites. But it is a cup game. We saw that against Roma.

"We did not take advantage of the chances we created in the first leg and nearly paid for it in the second tie. You have to be efficient from now on."