Up until now Greengrass has been firmly planted in the real world of cinema, but he is now in talks to make the leap to the world of sci-fi/fanatsy.  20th Century Fox is working towards a remake of Fantastic Voyage, the story of a scientist suffering from an unknown illness, only to have his colleagues miniaturized and injected into his body.  The previous incarnation was made in 1966, so it only seems appropriate to Fox that it get a modern day, big budget treatment. 

The Green Zone director is only in talks at the moment, but Fox is looking to strike while the iron is hot.