Their home-leg of their quarterfinal tie with Bayern Munich ended in a 2-2 draw.
Kaka said: “It will be an historic challenge, but I believe we can still qualify. It was a very difficult evening for me as I had to keep swapping wings to find some space.
“It is a pity that we conceded two goals, but we are used to this kind of challenge. The return leg will represent a battle to make history, but we can do well.”