Cerezo didn't hide that it's an option the club are considering but said it will be a tough transfer to pull off.
Griezmann's return to Atletico has stalled in recent weeks after the two clubs held talks over a swap deal which would have also involved Saul Niguez.
"We don't rule anything out but what we can say is that it's not an easy signing to make," he told Cadena COPE.
"We're waiting for news, not just on Griezmann but on other players, but I can tell you it's a difficult operation."
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