It was reported last week that an offer had been made to Natalie Portman – on the back of her acclaimed performance in Black Swan to star in Alfonso Cuarón’s Gravity, after Angelina Jolie turned down the role, twice.

While Portman has yet to read the script and accept the offer, it seems studio executive from Warner Bros. already have an actress on hold in case Portman, like Jolie, eventually declines.

Sandra Bullock, who won an Oscar for her acclaimed performance in The Blind Side, is reportedly waiting in the wings as a possible replacement, according to Collider

Warner Bros. are seemingly worried that Portman doesn’t have the star quality to carry such an expensive production, and would prefer to see an actress of Bullock’s stature headline the project.

Personally I feel Portman, in the many years she’s been acting, has proved herself to be a much more viable, prominent and versatile actress than Bullock. I’m not knocking Bullock, she really did put in an impressive performance in The Blind Side, but I don’t feel she’s got the background required for such a demanding role.

What do you think? If Portman does pass on Gravity, who would you like to see in the lead role?