The Spaniard has found himself unable to usurp Diego Lopez in Madrid's goal for their La Liga campaign, but is a regular in the Champions League and their domestic cup games.
With his excellent credentials Manchester City, Chelsea and Arsenal have been linked with the World Cup-winning stopper - but Casillas is determined to fight for a starting place at the Santiago Bernabeu.
"I am fighting for a starting position in Madrid. I have to fight to be in every game and then it is up to the decision of the coach. But I have to train and fight for the position.
"Today I'm happy. I want to continue playing but if not, I will say that I am sad. All I want is to help the club achieve the highest titles," the Spaniard told AS.
With Victor Valdes set to leave Barcelona at the end of this season, it had been rumoured Madrid's fiercest rivals might table a bid for Casillas.
However, their sporting director Andoni Zubizarreta has moved to quash that suggestion: "Real Madrid surely know what Casillas means for them.
"No, I did not have the temptation to make a move for Casillas."
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