The TV presenter has revealed the internal problems inside the Blancos dressing room, stating that the atmosphere at the club "is not exactly good"
A recent report in Marca suggested that Casillas and vice-skipper Sergio Ramos had threatened to leave Madrid if Mourinho was to stay at the club, and even though club president Florentino Perez has fiercely denied the rumour, internal problems problems appear to be rife.
"The atmosphere in the dressing room is not exactly good. It's common knowledge that Mourinho does not communicate with his players anymore," Carbonero told La Jugada.
"The dressing room is divided at the moment. We will have to wait and see what happens at the end of the season and whether Mourinho will leave."
The Portuguese has a contract with Madrid until 2016 after signing a new four-year deal in the summer, but several Spanish publications expect the former Inter boss to leave the club at the end of this season.