Arsene Wenger has admitted he will have to strengthen his side if they want to challenge for honours.
The Arsenal boss saw his side beaten 4-1 by Barcelona on Tuesday to end their Champions League hopes for another season.
Wenger concedes he will need to invest in the future if the Gunners are to progress.
“We have to add something, for sure, but we have some time to think about that,” admitted Wenger.
“We are at a stage where we’re developing players.
“[Theo] Walcott is 22; [Nicklas] Bendtner is 22; [Samir] Nasri, [Abou] Diaby and Denilson are 22 or 23. They’ve shown some great qualities and they’ll get stronger every year.
“We were very young and what we did was very positive. We had six or seven players under 23 in the team and we had plenty of opportunities. We showed we lacked maturity in the weight of the final ball.
“The defeat is difficult to handle because when you go out of the Champions League, the next day you are in front of a very empty future.
“Our dreams are involved in that but you have to address the disappointment and make sure you’re ready for the next game.
“It’s difficult to know how much we missed [the injured captain] Cesc Fabregas. We missed seven or eight players but I’d love to have had Fabregas.”