Sandro has been on-loan with Valladolid this season.
Gomez told Cadena Ser: “Sandro belongs to Everton, and you have already seen published that they intend to transfer him for around 5-6 million.
“Those are figures that Real Valladolid cannot afford, the boy is tremendously committed to the team; he is very happy here in Valladolid and managed to break his bad streak.
“We have the feeling that this season will end with 3-4 more goals, but his situation is complex because of the requests to which his home club aspires.
“I do not know exactly the will of Sandro, although he is happy here, but he belongs to another club and must be respected.
“The boy respects his contract and knows he has to come back."