Antoine Fuqua is directing the Sony drama, which will co-star Chloe Moretz as a young prostitute
Washington stars as black ops vigilante Robert McCall, the former intelligence officer played by Edward Woodward on the 1980s television series created by Michael Sloan.
Csokas will play a rogue CIA agent who protects the Russian mob and winds up crossing paths with the vengeful protagonist.
Chloe Moretz is nearing a deal for the female lead of a young prostitute who the lead must protect.
Sony hopes to launch a franchise with "The Equalizer," which Escape Artists partners Todd Black, Jason Blumenthal and Steve Tisch are producing with Alex Siskin, Mace Neufeld, Tony Eldridge and Sloan. David Bloomfield will executive produce the film, which hits theaters on April 11, 2014.
Csokas is well known to international audiences, having been involved with the "Star Wars," "Lord of the Rings" and "Jason Bourne" franchises, as well as Disney's billion dollar grosser "Alice in Wonderland." He recently starred in "The Debt" and will soon be seen in Sony's "The Amazing Spider-Man 2," Darren Aronofsky's "Noah" and Robert Rodriguez's sequel "Sin City: A Dame to Kill For."
Csokas is repped by WME, Anonymous Content, Sue Barnett and Associates and attorney David Krintzman.