The Chelsea-owned goalkeeper is on-loan to the end of this season.
"Everyone knows that Courtois is owned by Chelsea, he has two years on his contract and for three played with us. I have confidence and faith he'll stay at least another year," said Cerezo.
"For me right now, he is the best in Europe. We are waiting to see what the final solution is, but I do not want Chelsea to sell Courtois."
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