Del Bosque said: "We know he (Casillas) is a legend in Spanish football, that no-one has achieved what he has and he's in a difficult situation. What's important is that he is fit again, he's training and we have time to make our decisions (for the Confederations Cup).
"He is the player who has played for us most, more than 140 games and we love him a lot. It would be normal to have him with us.
"I don't want to speculate because I have to respect his club, coach and I don't want to upset anyone. But I don't imagine in England they would have questioned Shilton in this situation or other players who were icons in their national team.
"We have to protect the players who have given so much to their country."