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Law and actor Aaron Johnson are in negotiations to play key characters in the movie though it is not clear who will play what, a newspaper reported.
The movie is being directed by Joe Wright, who reunites with Knightley for the third time after the success of period flicks like `Atonement` and `Pride & Prejudice`.
Knightley will play the title role of Anna, a woman who is torn between a loveless marriage and her struggle to cope with her attraction to a soldier.
The story of love and guilt has been adapted by Tom Stoppard while Working Title`s Tim Bevan is producing.
The novel, considered one of the most poignant Stories of love and guilt, has already been adapted many Times, including a 1997 Warner Bros pic starring Sophie Marceau and Sean Bean.