While Messi has been lauded as the 'greatest player in the world', Arsenal must turn their attention back to domestic action with the Premier League title now their only chance of landing silverware this season.
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And Walcott, who set up Nicklas Bendtner as Arsenal took the lead before Messi dominated proceedings, wants his side to learn from their experience in the Nou Camp and move forward.
"It is disappointing to go out after getting that early goal, but at times you just have to sit back and admire it, because it was fantastic," Walcott said.
"Lionel Messi is probably the only player on the planet who could have scored goals like that and iIt is one of those nights where we have to learn from our mistakes.
"It is a great experience for us, we now have to look forward to the game against Spurs on Wednesday and have to come right back because we have still got the Premier League to have a shout at.
"Tottenham away is a very big game - we just have to try and bounce back from this disappointment."
Wenger echoed Walcott's sentiments. The Arsenal manager said: "We have to deal with the disappointment and make sure we are ready for the next game.
"Of course you worry because it is a big disappointment and we have to recover quickly because we cannot drop any points. That is why we have to recover and try to focus on the Premier League completely.
"For us over the years White Hart Lane has been a place where we have done well, so we will not go there with a negative history - but it forces you to focus straight away because you know it will be a derby."