Crespo's short film, a winner at this year’s Spanish Goya Awards, will compete against other live action short movies from the UK, France, Denmark and Finland.
Aquel no era Yo (That wasn't me) tells the story of Paula, a Spanish volunteer in Africa, and Kaney, a young boy who’s part of a militia of child soldiers.
The plot focuses on how their lives change forever after a lethal shot is fired.
Although the movie is set in an unspecific spot on the African continent, Crespo and his team actually filmed it just outside the city of Toledo, in central Spain.
"We achieved great results thanks to our artistic team and by digitally adding African vegetation and what not," Crespo told Spanish daily 20 minutos.
Spanish film critics believe the chances of Aquel no era Yo being the winner are relatively high because the spectacular, action-packed nature of the short film is popular in Oscar films.
"The good thing is that they've watched it on a big screen and that way it's more striking," Crespo adds.
"The film grabs the spectator and the tension keeps building until the end."
Spain's previous Oscar winners include Javier Bardem for Best Supporting Actor in No Country for Old Men (2007) and director Pedro Almodóvar for Best Original Screenplay for Talk to her (2002).