Madrid, who also received further punishments from UEFA for other incidents during the game, have already announced they will appeal the ruling.
The club said in a statement tonight: "Real Madrid considers this resolution still suffers from the same defects found at the start of the disciplinary case, which made it impossible for our coach to use his right to defend himself, since the exact statements for which the disciplinary case was opened are still unknown."
Karanka also undertook media duties before and after this week's semi-final second leg with Barca, where a 1-1 draw saw Madrid tumble out of Europe 3-1 on aggregate.
Asked about Mourinho's reaction to his ban, Karanka said: "When you receive a sanction like that you never receive it well and more so if you don't know the reason for the sanction.
"The club have already announced they are going to appeal and, on a personal level, Mourinho is going to defend himself and he will fight to the end."
Karanka claimed the club still have not been told the reason for Mourinho's punishment.
"As things stand today, UEFA haven't communicated the reason for the sanctions against the coach," he said.