Walt Disney Pictures’ “The Three Musketeers” has added its third musketeer — Oliver Platt — as principal casting on the film was completed, producers Joe Roth and Roger Birnbaum confirmed yesterday.

Platt (“Flatliners”) will play Porthos, joining previously announced Kiefer Sutherland (Athos) and Charlie Sheen (Aramis), as well as Chris O’Donnell as musketeer wannabe D’Artagnan.

Other key roles that were filled include Tim Curry as Cardinal Richelieu and Gabrielle Anwar (“Scent of a Woman”).

Stephen Herek will direct “Musketeers,” which Disney plans to rush into production in April, with Roth and Birnbaum’s Caravan Pictures producing and Jon Avnet and Jordan Kerner exec producing.

This will be at least the fifth major film based on Dumas’ book, following productions in 1935, 1939, 1948 and 1974. TriStar was also developing its own “Three Musketeers” but scrapped its plans in January, citing script problems.

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