The Real Madrid goalkeeper says the Blancos squad go into Saturday's match against Barcelona in high spirits following their Champions League victory over the Italian champions
The 32-year-old shot-stopper is unlikely to start ahead of Diego Lopez against Barca in Saturday's Clasico, but is eager to grab the opportunity to move level on points with the Catalan club.
"A victory on Saturday will carry us to the top of the table with Barcelona," he told Canal Plus. "We have to go to Camp Nou keeping in mind this victory."
Two first-half goals on Wednesday from Cristiano Ronaldo ensured Madrid maintained their commanding position at the top of Group B.
Giorgio Chiellini was sent off for the Bianconeri, and Casillas admits the side struggled somewhat despite having a man advantage over their Italian opposition.
"We have taken a very important step," Casillas said. "It was not easy even when they were down to 10 men for almost the entire second half. Now we go to Turin, aware that even a draw could lead us to the knock-out stages."
Casillas has been linked with a move away from the Santiago Bernabeu after losing his place in the side, but was keen to stress that he has not asked to leave the club.
"Regarding my future, I didn't give an ultimatum to Real Madrid," the Spain international added. "Unfortunately, my name is always in the media and some people do nothing but talk about what I say, when I say it and why I say it."