Outgoing Spain coach Vicente Del Bosque revealed he sent a message to every member of the squad that took part at Euro 2016 to notify them of his exit, except for Iker Casillas.
The 65-year-old won the 2010 World Cup and Euro 2012 in a seven-year spell as Spain boss.
However, Del Bosque revealed his relationship with Casillas has deteriorated, with the goalkeeper unhappy at being used as a substitute behind new first-choice David De Gea.
"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."