After heading into the second leg at Camp Nou trailing by a 2-0 deficit, Arsenal succumbed to further goals from Neymar, Luis Suarez and Lionel Messi, but Ferdinand feels that the club should not be too downbeat after a solid performance in Spain.
Midfielder Mohamed Elneny netted his first goal for the Gunners during the second half, while Ferdinand was particularly impressed with the performance of Alex Iwobi, who was handed a first start in the competition by Wenger.
The 19-year-old linked up well with frontman Danny Welbeck, and Ferdinand has suggested that the duo did enough to justify selection against Everton in the Premier League on Saturday afternoon.
The former Manchester United defender said: "They came here and had a go, and that's all that you could ask from these players. They created chances but didn't finish them. That can happen on some days.
"There are some positives. I thought Iwobi was very good today, he showed great promise. Him and Welbeck seemed to forge a great partnership, which looks promising. We'll see if they will be rewarded by playing in the next game."
Iwobi has now played 13 times for Arsenal in all competitions this season, while Welbeck has scored three times in eight appearances since returning from a serious knee injury.