Robert Luketic is in negotiations to direct 21 for Columbia Pictures. The helmer, who had been prepping to direct the big-screen version of the '80s soap Dallas for Regency Enterprises/20th Century Fox, likely will make 21 his next project.

It is unclear how Luketic's negotiations with Columbia will affect his involvement in Dallas or the ongoing casting of the ensemble film. 21, based on Ben Mezrich's best-selling nonfiction book "Bringing Down the House: The Inside Story of Six M.I.T. Students Who Took Vegas for Millions," revolves around a group of young men who become experts in the art of card counting.