Cesc was branded only a "40 per cent" chance to be fit for the clash by manager Arsene Wenger.
But the midfielder told The Sun: "Ever since the draw was made I've dreamt about this game and I am desperate to play in it.
"I've never disguised my affection for Barcelona, it's where I was brought up and where I learned so many beautiful things about football.
"But Arsenal have the same principles and this is our chance to show the world that we can stand shoulder to shoulder with Barcelona and emerge triumphant. You can't imagine how much I want to be part of that."
He also told a close friend: "I'll do everything I can to play."