Keira Knightley has already signed on to star in the Joe Wright version of the Leo Tolstoy novel Anna Karenina.  Now, according to Variety, Aaron Johnson and Jude Law are in negotiations to appear in the film as well.

Anna Karenina follows the story of a love affair between a rebellious Anna and officer Count Vronsky.  Anna rejects her passionless marriage and must face the rejection of society.  Set in 19th Century Russia, the story tells of Anna's struggle in a society that doesn't accept her and her desire to be with a man she loves despite her marriage.

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Working Title is producing the film and it is targeted to start filming in the fall.

Knightley has worked with director Joe Wright on a number of occasion before, in both Atonement and Pride and Prejudice. Both the director and actor have a tendency to attach themselves to period dramas, this one included.