Could Colin Firth Join Spike Lee's Oldboy?

Twitch reports that Spike Lee is trying to get Colin Firth (Single Man, King's Speech, Tinker) to play the villain in his adaption of Oldboy. The film currently stars Josh Brolin (No Country For Old Men) as the main character who is kidnapped and imprisoned only to be released years later. Rooney Mara (Dragon Tattoo) and Christian Bale had been rumored in the mix for roles but it was confirmed by Variety Mara has turned it down.