Gallas told Skysports.com: “Those who say ‘Thierry Henry was wrong not to join Barca, he has lacked ambition’, are wrong.
“We will do everything to prove it.
“This club has ambition. If not, I wouldn’t be here.
“Arsenal directors told me many good words. The future is here. The players are skilled.
“Arsenal are trying to build in order to become one of the greatest clubs in the world. The Emirates stadium is huge, 62,000 people can go to matches there.
“We now have to win titles, the Champions League, The Premiership, in order to show we are one of the best in the world.
“I haven’t reached my best yet, I can progress in some areas of my game. I can score more but I won’t tell which aspects I need to improve.
“I will do everything to succeed.”