Casillas is determined to regain his position.
He said: "I'm training myself to fight, to fight and to recover the position. It is the goal that I have and that the coach selects me in the next game."
The Spain international added: "I feel good but I'm not a machine, I have to train every day and there are better and worse times, but I feel fine.
"Above Casillas is Madrid. The decision is the coach's.
"In any case, the day I no longer have the desire to work, I'll stop."