Arsene Wenger blamed a 'lack of maturity' for his Arsenal side's failure to see out Wednesday night's thriller from a seemingly untouchable position going into the final 90 seconds of normal time.
The home side were 4-2 up when Jermaine Jenas spectacularly capitalised on Gael Clichy's slip on halfway, carrying the ball 30 yards before curling into the far corner to make it 4-3.
Four minutes of added time were soon displayed and with three minutes and 15 seconds of that extra time gone, Aaron Lennon was on hand to slot home the equaliser after Luka Modric's dipping volley hit the post.
Wenger said: "We produced the game we wanted to and put a lot of energy into the performance. The negative side is that we didn't win and I believe that was down to a lack of maturity.
"I would like to keep the positives because I believe we were really outstanding and I don't believe that the lack of maturity is linked to experience.
"The maturity will improve with intelligence. I think my players are intelligent and they will learn from their mistakes.
"In life you must make the maximum with what you have. In a game like this we did not get the result that was available, we must think 'how did that happen?' and ensure that it doesn't happen again."