[Getty Images]Arsenal captain Martin Odegaard believes the club must take lessons from their Champions League semi-final loss against Paris St-Germain.The result ensured Arsenal will have gone five years without a trophy under Mikel Arteta but the Norway midfielder wants his team-mates to use this experience as an opportunity to improve for next season: "It's very painful to be honest," said Odegaard. "We started the game really well, on the front foot, took control and created some big moments.