Valencia coach Nuno says Enzo Perez will see action against Real Madrid.
Perez arrived last week from Benfica in a €25 million deal.
"We have that choice. He's in the squad. He is prepared and ready for the competition, we will consider him," said Nuno.
"He is a versatile midfielder with good offensive capabilities. He is very complete and will provide plenty of good things for us, especially in midfield.
"The signing of Enzo is a very important one for us. The market is still open and players can still arrive, but for now I'm happy with what we have."