Atletico Madrid president Enrique Cerezo has fired a warning at unsettled attacker Joao Felix.
Fed-up with his situation in Madrid, Felix is prepared to demand a transfer in January, says AS.
Manchester United, Manchester City, Bayern Munich and Juventus are all watching developments closely, but Cerezo yesterday had a message for Felix and any interested club.
"For us, he (João Félix) is not for sale," he said on night radio.
Felix is in his third season Atletico, having joined from Benfica for €127m.
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