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"The release clauses are not there to be paid," Perez said. "If there has to be sale, it's negotiated.
Cristiano Ronaldo was sent off during Juventus' 2-0 win over Valencia and will now face a minimum one-match suspension.
Former England captain Kelly Smith has criticised Emre Can's comments on women's football following Cristiano Ronaldo's red card on Wednesday.
Cristiano Ronaldo is likely to serve a one-game Champions League ban, sources have told ESPN FC, which would allow him to face Manchester United.
Juventus' Emre Can apologised for causing any offence after he said the red card shown to Cristiano Ronaldo was wrong because "we're not women."
Cristiano Ronaldo is still a difference maker and a ruthless finisher, but he can't do what he did at 25. He must accept that and remodel his game.
Cristiano Ronaldo left the pitch in tears after being sent off on his Champions League debut for Juventus. But how long is his suspension?
Cristiano Ronaldo was reluctant to leave the field at the Mestalla and appeared to be on the verge of tears as he finally walked to the tunnel.
Cristiano Ronaldo cried off on Wednesday night as his Champions League debut for Juventus ended with a controversial red card.
The fact Juve went down to 10 men early and still scored two and kept a clean sheet against Valencia is a testament to Max Allegri and his squad.
Ronaldo was dismissed after a clash with Jeison Murillo was spotted by the assistant referee and communicated to German referee Felix Brych.
Juventus overcame a first-half Cristiano Ronaldo red card to beat Valencia 2-0 in their Champions League opener at the Mestalla on Wednesday.