Forward Mbappe, 18, has produced a string of outstanding performances to help Monaco top Ligue 1 and reach the Champions League semifinals.
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Real Madrid, Manchester City and Manchester United are among the clubs tracking Mbappe, with reports in the Spanish media suggesting Madrid could offer in the region of 8364;100 million for him.
Mbappe signed his first professional contract just over a year ago, and Cordon said that deal included a release clause.
"Yes, he has one -- but it's a lot, a lot of money," he said. "I didn't do Mbappe's contract and I can't tell you the details of the clause, but it's a lot of money.