Castellon admit their at deadlock in negotiations with Real Madrid for striker Adam Szalai.
The Segunda Liga club want to sign the Hungary international for the January market.
"At present there is no news. The sports management is working as fast as possible, but there's nothing yet. His signing will be complicated, but it is not excluded.
"So we are considering several alternatives, but are in no hurry," confirmed José Laparra, the Castellon president."