Mourinho has found himself in the spotlight at Madrid following an under-par start to the season which has seen the reigning champions slump 11 points behind arch rivals Barcelona.
"We have the best coach in the world," Perez said. "He's had to endure unjust attacks and insults, even one that touches the dignity of his person. From here, all my gratitude and affection.
"There is no unattainable goals, as you know our coach and players.
"Already this season has made us happy with the first title of the season, as the Super Cup."