John Cusack and Johnny Knoxville will co-star in Josh Stern's comedy Carnaval.  According to THR, Cusack will play sports scout who, in order to inherit his agency, must heads to Rio de Janeiro to recruit the world's top soccer player.  However, he has to do it during the madness of the city's annual festival, Carnaval.  Knoxville will play his best friend who comes along for the trip, but ends up having an affair with the soccer star's girlfriend and this is how conflict happens.Stern will also re-write the script from former agent David Styne.  Shooting is expected to begin this January.  Cusack will next be seen playing Edgar Allan Poe in the thriller The Raven and he's signed on to star in Lee Daniels' The Paperboy.  Knoxville's slate continues to fill up as he's set to co-star with Patton Oswalt in an untitled comedy from Todd Rohal, and earlier this week we learned Knoxville was on board Arnold Schwarzenegger's comeback film, The Last Stand.