Arsenal manager Arsene Wenger maintained his opposition to the away goals rule in Champions League football, calling it "outdated".
The Gunners won 2-0 against Monaco on 17 March but went out of the competition, losing 3-3 on aggregate with Monaco going through on away goals.
Of the English wipeout, Wenger said: "It's the first time in 19 years [actually the second time in three years]. I don't think that you can draw a general conclusion.
"Two teams have gone out on away goals, which I think should be questioned because it's a rule that is outdated now and that has to be changed.
"I've fought for that for a long time. In a direct knockout, it's important that you're very efficient and a bit lucky as well. None of the teams, apart from Barcelona, look to be superior in Europe today. Two other teams, Chelsea and Arsenal, could have gone through.
"It should count maybe after extra-time because this rule has been created in the 1960s to encourage the teams to attack away from home. Since that football has changed. The weight of the away goal is too big today."