Real Madrid striker Adam Szalai is interesting Segunda Liga Castellon.
The young Hungary international is ready to leave Real's Castilla team this January.
Castellon coach Bartolome Marquez said: "We must find an alternative because we have a deficit in the centre forward position.
"I have discussed this and I will not mention names. I'd like to have the best, but I trust the discretion of the club to strengthen the attack."