The 34 year old, known for playing lovable, shy Fez in hit sitcom That '70s Show, reveals he blindly signed up to the project because he was such a big fan of Rodriguez - and he was flattered after learning he would be leading the cast as crime lord Carlos, a role created specially for him.
Valderrama tells People.com, "After an initial audition, I got a text from (Rodriguez) that said, 'Hey, I handcrafted this character for you that a lot of people haven't seen you do.'
"I now have that text on my wall. I said, 'Yes' without knowing what I was playing and 24 hours later I was playing the villain."
The actor reveals his former Tv co-stars, including Mila Kunis and Ashton Kutcher, are overjoyed for him for landing a role working with his idol.
He says, "I stay in touch with everyone from my That '70s Show cast and they are so proud of me getting to do this. They have known me since 1997, '98 and they know how obsessed I have been with everything that Robert has ever done."
From Dusk Till Dawn is based on the 1996 vampire film of the same name, which starred George Clooney and Quentin Tarantino as criminals who stumble across a nightclub filled with vampires.
Valderrama will co-star in the new Tv version with Miami Vice veteran Don Johnson as Sheriff Earl MCGraw, with G.I. Joe: Retaliation actor D.J. Cotrona and Zane Holtz taking the roles played by Clooney and Tarantino respectively.