Perez is adamant the German veteran is a very valued player in Madrid, despite criticism of his Euros performance.
The president has informed board members that Kroos is not for sale, despite talk of a raft of senior players being made available.
A board source told Okdiario: "If they want Kroos, they can come with an offer of more than 70 million euros and we will discuss it."
Kroos has a contract with Real Madrid to 2023.
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