Vicente Del Bosque has revealed he sent a message to every member of his Euro 2016 squad to notify them he was resigning as Spain boss, except for Iker Casillas.
Del Bosque announced on Thursday he would be stepping down from his role as coach after seeing Spain bow out of the European Championship last-16 stage against Italy.
And the 65-year-old, who won the 2010 World Cup and Euro 2012 in an eight-year spell as Spain boss, has since revealed Casillas was the only member of his squad he didn't make aware of his departure.
Del Bosque has claimed his relationship with Casillas, who he has known since the goalkeeper was nine, deteriorated after he dropped him in favour of making David de Gea his new number one.
"With his team-mates he has been fine, correct, but with the coaching staff it is so so," Del Bosque told El Larguero.
"That is why the only player I did not send a message to has been Casillas.
"He feels bad with me, but also with [physical trainer] Javier Minano or [assistant coach] Toni Grande. With everyone else he has been fine. The anger has been with us."
"For sure he is hurting or displeased with me and I understand that. He thinks we have done the wrong thing," added Del Bosque, who said the decision to play De Gea in goals was a feeling his body had.
"But we have to be proud of a player who has 167 games with the national team. I don't believe three or four games will hurt his resume.
"Casillas hasn't disappointed me. I have a great appreciation for him. I have known him since he was nine years old."