Leeds United spent £3 million on the attacker this past summer.
The former Real Madrid youth joined Leeds in a £3 million deal from Huesca this summer.
It's big money but so far the 26-year-old is going the right way about justifying such a lofty transfer fee, scoring five goals in all competitions, including a League Cup hat-trick.
You can see he has a bit of class about him, and compatriot Hernandez, who joined the Whites from Swansea City last summer, is pleased with how he has done since arriving in West Yorkshire.
He told LUTV: "I've never played against him but I know he played for Real Madrid's young team. He's a good player.
"Sometimes it's difficult for Spanish players to come to England and adapt but he has started very good."
Thomas Christiansen's side remain unbeaten from five Championship games, sitting third in the table after winning three and drawing two so far.
Tomorrow, Saiz and his team-mates host Burton Albion at Elland Road.