Arsenal boss Arsene Wenger has congratulated Birmingham City for their Carling Cup win.
Obafemi Martins came off the bench and scored the last-gasp winner after Robin van Persie had cancelled out Nikola Zigic's opener.
"Congratulations to Birmingham, they took advantage of the mistake [and] they took the trophy which hurts us tremendously," said Wenger.
"We have to be proud of our attitude, continue with our belief, pick ourselves up and face the other challenges we have.
"We will face a lot of questions after that mistake tonight, but we have to be strong enough to stand up.
"It is a good opportunity to show that we have the mental strength to respond to the situation like that."
Wenger added: "It is a massive disappointment for the team, but we have massive challenges in front of us - the Carling Cup is four games, five games but a championship season is 38. We will not throw 38 games away because of one game.
"I am confident we have the character and this is a good opportunity to show it."
