Casillas, 31, winner of the FIFA World Cup™ and two UEFA European Championships, added it would be time for the younger generation to take up the baton.
"A lot of us will retire from the national side after the World Cup," said Casillas. "The younger generation will replace us. It is why winning the World Cup again would be a wonderful way to bow out."
Casillas, though, said he had every intention of playing on with his club side Real Madrid until his present contract finishes in 2017.
"I will play for as long as my head tells me to," he said. "At the end of the day the wear and tear is more to do with the head than the body.
"For the moment my plan is to go to the end of my contract."
"Play anywhere other than Real? For the moment I am not even thinking about it," said Casillas, who made his Real debut in 1999.
"It is my club and my home from home, and if in the future, I do move, it will be outside Spain and to a club which is not directly in competition with Real."