"I have faith in all the players in our squad," Perez said.
"Karim is a great player and we get offers for him all the time, every summer.
"All I can say is that the coach is the one who has the authority to do what he believes is right."
On Alonso he said: "He is one of the most important players and able to overcome everything.
"If he wants to stay at Madrid, he will stay. If he thinks his future is elsewhere then I understand perfectly.
"He is a player who has given everything to Madrid and he will have every opportunity to do what he wants."
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